companion-sequence · complete
House of Leaves
A linked sequence consisting of House of Leaves and its separately published companion novella, The Whalestoe Letters.
2 books · View reading order →
Series by book count
Longest book series
series · complete
House of Shadows
by Darcy Coates
A supernatural gothic series also marketed as Ghosts and Shadows.
2 books · View reading order →
duology · complete
How Not to Fall Duology
A contemporary romance duology written by Emily Nagoski under the pseudonym Emily Foster.
2 books · View reading order →
series · complete
How to Be
by TJ Klune
A contemporary queer romance series about Gus and Casey.
2 books · View reading order →
comic series · ongoing
Huck
by Mark Millar
Creator-owned superhero series.
2 books · View reading order →
novel series · ongoing
Hundred Kingdoms
A fantasy series set across magical kingdoms, including To Kill a Kingdom and Princess of Souls.
2 books · View reading order →
duology · complete
Hurog Duology
Fantasy novels set in the kingdom of Hurog and centered on Ward of Hurog.
2 books · View reading order →
novel sequence · complete
I Hadn't Meant to Tell You This
A connected two-book sequence about friendship, family secrets, trauma, and healing.
2 books · View reading order →
duology · complete
I Hope This Doesn't Find You
by Ann Liang
A contemporary young adult romance novel and its separately published sequel novella.
2 books · View reading order →
duology · complete
I Want to Die but I Want to Eat Tteokbokki
by Baek Se-hee
A two-volume memoir series based on Baek Se-hee's psychiatric consultations and reflections on depression, anxiety, and recovery.
2 books · View reading order →
series · complete
I Wish You All the Best
by Mason Deaver
A series comprising I Wish You All the Best and its Christmas companion novella.
2 books · View reading order →
paper-series · unknown
I.P.S. Papers
Policy and research paper series published by the Institute for Palestine Studies.
2 books · View reading order →
novel series · complete
Ice Limit
A linked adventure-thriller series about the mysterious extraterrestrial object discovered beneath the Antarctic ice.
2 books · View reading order →
novel series · completed
Icons
A dystopian science-fiction series by Margaret Stohl.
2 books · View reading order →
essay-series · complete
Idle Fellow
A sequence of humorous essay collections built around the persona of an idle fellow.
2 books · View reading order →
duology · complete
If He Had Been with Me
by Laura Nowlin
A two-book companion series about Autumn and Finn, told across multiple perspectives and centered on love, friendship, loss, and regret.
2 books · View reading order →
novel series · complete
If I Stay
by Gayle Forman
A two-novel series following Mia Hall and Adam Wilde before and after a life-changing accident.
2 books · View reading order →
novel sequence · complete
If You Come Softly
A two-book sequence about love, loss, grief, and the lasting effects of an interracial teenage romance.
2 books · View reading order →
nonfiction series · ongoing
Ikigai
A series of practical and philosophical books exploring ikigai, purpose, happiness, and longevity, including works coauthored with Francesc Miralles.
2 books · View reading order →
collected prose · complete
Il secondo mestiere
The two-volume posthumous collection of Montale's prose, criticism, music writing, and cultural journalism.
2 books · View reading order →
duology · complete
Ilium/Olympos
by Dan Simmons
A science-fiction duology blending the Trojan War, Shakespeare, and posthuman far-future civilizations.
2 books · View reading order →
series · completed
Illusions
by Richard Bach
A philosophical fiction series following encounters with the unconventional messiah Donald Shimoda and his continuing influence.
2 books · View reading order →
novel-series · complete
Immortal Enemies
A paranormal romance series about ancient immortal adversaries.
2 books · View reading order →
shared-universe · ongoing
Imogenverse
A shared universe of contemporary young adult novels connected by characters and the Blackwell College setting introduced in Imogen, Obviously.
2 books · View reading order →
novel-series · complete
Imperia
A fantasy romance series beginning with The Stone Prince.
2 books · View reading order →
duology · complete
Impulse series
A completed young-adult verse series about three teenagers whose lives intersect after suicide attempts.
2 books · View reading order →
novella series · complete
In a Nutshell
A short-fiction series.
2 books · View reading order →
duet · completed
In Luv Duet
A contemporary romance duet co-authored by Rebecca Yarros and Jay Crownover.
2 books · View reading order →
novel-series · complete
Indexing
A contemporary fantasy series in which fairy-tale narratives become dangerous realities managed by the ATI Management Bureau.
2 books · View reading order →
series · open
India 2047
by Ian McDonald
A shared future-history of India and South Asia in the mid-twenty-first century.
2 books · View reading order →
series · complete
Inferno
Dante-inspired afterlife adventure sequence co-written with Larry Niven.
2 books · View reading order →
novel · ongoing
Infinity Alchemist
A young adult fantasy series about alchemy, power, identity, and revolution in the world of New Anglia.
2 books · View reading order →
series · completed
Infinity Blade
Novellas based on the Infinity Blade action-role-playing game.
2 books · View reading order →
multi-author series · completed
Infinity Ring
A multi-author alternate-history time-travel series; Dashner wrote the first and seventh books.
2 books · View reading order →
book-series · complete
Ink Books
A series of books about tattoos, their makers, and the personal stories behind them, co-created by Wendy MacNaughton and Isaac Fitzgerald.
2 books · View reading order →
series · ongoing
Innkeeper Chronicles Graphic Novels
Graphic-novel adaptations of the Innkeeper Chronicles.
2 books · View reading order →
paranormal-romance-series · complete
Insatiable
by Meg Cabot
A paranormal adult romance series about a soap-opera writer with precognitive powers drawn into a war involving demons and vampires.
2 books · View reading order →
duology · complete
Insider Series
A science-fiction duology about Trella and the divided society inside a vast metal cube.
2 books · View reading order →
series · complete
Interesting Zoology
A nonfiction and children's-literature grouping about animals.
2 books · View reading order →
book-series · ongoing
Interplay
A series of scholarly collections in comparative literature and the arts published by Undena Publications.
2 books · View reading order →
novel sequence · completed
Interstellar Empire
by John Brunner
A space-opera sequence concerning the decline and possible renewal of a galactic empire.
2 books · View reading order →
novel series · complete
Into the Crooked Place
A completed young adult fantasy duology about four magical outsiders navigating crime, rebellion, and dark magic in Creije.
2 books · View reading order →
duology · completed
Into the Mist
by P. C. Cast
Post-apocalyptic fantasy duology by P. C. Cast.
2 books · View reading order →
series · complete
Invasion America
Novels based on the animated television series Invasion America.
2 books · View reading order →
comic-series · completed
Invincible
by Rus Wooton
Robert Kirkman, Cory Walker, and Ryan Ottley's superhero comics series.
2 books · View reading order →
comic-series · ongoing
Invincible Universe: Battle Beast
An Invincible Universe series written by Robert Kirkman and illustrated by Ryan Ottley.
2 books · View reading order →
novel-series · complete
Io
by Wesley Chu
A science-fiction series set in the Tao universe, following Ella Patel and the Quasing alien Io.
2 books · View reading order →
novel-series · ongoing
Iron Widow
A science-fiction trilogy blending Chinese history and mythology with mecha fiction, centered on Zetian’s struggle against the patriarchal military system of Huaxia.
2 books · View reading order →
comic-series · concluded
Ironwood
Adult fantasy comic series written and illustrated by Bill Willingham.
2 books · View reading order →
comic series · completed
Isaac Asimov's I-Bots
by Steven Grant
Science-fiction comic series based on an Isaac Asimov concept, scripted by Steven Grant.
2 books · View reading order →
novel · complete
Islands of Blood and Storm
An adult fantasy duology set in a Caribbean-inspired archipelago shaped by colonial violence, resistance, and supernatural power.
2 books · View reading order →
young-adult-fiction-series · completed
It Chicks
by Tia Williams
A two-book young adult series about ambitious, drama-filled students at a New York City performing arts school.
2 books · View reading order →
series · complete
It Ends with Us
A two-book contemporary romance series following Lily and Atlas.
2 books · View reading order →
series · complete
It Happened in Charleston
by Sarah Adams
A contemporary romance series set among connected characters in Charleston.
2 books · View reading order →
series · complete
It Happened in Nashville
by Sarah Adams
A contemporary romance series set in Nashville.
2 books · View reading order →
duology · complete
It Takes a Thief...
by Rob J. Hayes
A light-hearted steampunk series of heist adventures.
2 books · View reading order →
series · complete
Jack of Kinrowan
A two-novel urban-faerie sequence about Jacky Rowan.
2 books · View reading order →
series · complete
Jack Quick
A crime-thriller series following disgraced television producer Jack Quick as he investigates murders and media scandals.
2 books · View reading order →
novel series · ongoing
Jack Sawyer
by Stephen King
The series following Jack Sawyer across the Territories and the parallel worlds connected to them.
2 books · View reading order →
nonfiction series · completed
Jack the Ripper
Nonfiction investigations of Jack the Ripper and Walter Sickert.
2 books · View reading order →