All book series

Space Odyssey

Arthur C. Clarke · 4 books · 1968–1997

The Bone Season

Samantha Shannon · 4 books · 2013–2017

Little Elephant

Heluiz Chandler Washburne · 4 books · 1937–1941

Ghosthunters

Cornelia Funke · 4 books

Serrano Legacy

Elizabeth Moon · 4 books · 1997–2000

Philo Vance

S. S. Van Dine · 4 books · 1926–1929

The Lost Stars

John G. Hemry · 4 books · 2012–2014

Bahzell

David Weber · 4 books · 1995–2012

Vampire Story

David Wellington · 4 books · 2006–2009

Fear Street

R. L. Stine · 4 books · 1989–1995

The Cthulhu Casebooks

James Lovegrove · 4 books · 2016–2019

The Nicci Chronicles

Terry Goodkind · 4 books · 2017–2020

Moomins

Tove Jansson · 4 books · 1952–1980

Seasons of Horror

Dan Simmons · 4 books · 1991–2002

Speglarnas hemlighet

Erika Vallin · 4 books · 2012–2017

Jack West Jr series

Matthew Reilly · 4 books · 2005–2016

Mass Effect

Drew Karpyshyn · 4 books · 2007–2012

The Bride Quartet

Nora Roberts · 4 books · 2009–2010

Bob Morane

Henri Vernes · 4 books · 1953–1959

Brunhild the Dragonslayer

Yuiko Agarizaki · 4 books · 2022–2024

The Last King of Osten Ard

Tad Williams · 4 books · 2017–2023

Under the Oak Tree

Suji Kim · 4 books · 2024–2026

The Paladins

David Dalglish · 4 books · 2011–2012

Nameless Souls MC

Evie Mitchell · 4 books · 2020–2023

Iron Gold Tetralogy

Pierce Brown · 4 books · 2018–2023

Dragonfury Scotland

Coreene Callahan · 4 books

The War For Magic

P.A. Mason · 4 books

SYNCD Trilogy

David A. Lyons · 4 books · 2025–2026

The Fallen

Gabrielle Sands · 4 books · 2022–2023

Black Camelot

Darius Myers · 4 books · 2019–2022

Monster Hunter Memoirs

John Ringo · 4 books · 2016–2023

The Healing Hearts

Ruby Scott · 4 books · 2022–2026

The Fassa Tails

S. S. Coulter · 4 books · 2023–2024

The World of Lone Wolf

Joe Dever · 4 books · 1985–1986

Shadowmarch

Tad Williams · 4 books · 2004–2010

The Noah Vale Mysteries

P.G. Lark · 4 books · 2026

Lily Starling

Christian Hurst · 4 books · 2025–2026

Winnetou

Karl May · 4 books · 1893–1910

The Six Bullerby Children

Astrid Lindgren · 4 books · 1947–1962

Old Kingdom

Garth Nix · 4 books · 1995–2005

Southern Reach Series

Jeff VanderMeer · 4 books · 2014–2024

Ægypt

John Crowley · 4 books · 1987–2007

Caster Chronicles

Kami Garcia · 4 books · 2009–2012

Divergent

Veronica Roth · 4 books · 2011–2014

The Reckoners

Brandon Sanderson · 4 books · 2013–2016

Fate/kaleid liner Prisma Illya

Hiroshi Hiroyama · 4 books

Nussekudden

Håkan Jaensson · 4 books · 1984–1994

Course of Theoretical Physics

Lev Landau · 4 books · 1938–1986

Mr. Men

Roger Hargreaves · 4 books · 1971–1978

Kushiel's Legacy

Jacqueline Carey · 4 books · 2001–2003

Voices of Utopia

Svetlana Alexievich · 4 books · 1985–2013

The Rain Wild Chronicles

Robin Hobb · 4 books · 2009–2013

Neapolitan Novels

Elena Ferrante · 4 books · 2011–2014

Crusades tetralogy

Jan Guillou · 4 books · 1998–2001

Shadow Quest

Kiersten Fay · 4 books · 2011–2013

The Mirror Visitor

Christelle Dabos · 4 books · 2013–2019

Planet of Adventure

Jack Vance · 4 books · 1968–1970

Arthur series

Luc Besson · 4 books · 2002–2005

Pretty Little Liars

Sara Shepard · 4 books · 2006–2008

The Raven Cycle

Maggie Stiefvater · 4 books · 2012–2016