6 books in series

Stephen King's The Dark Tower

Stephen King's The Dark Tower is a 6-book series with 6 primary works first released in 2009 with contributions by Stephen King, Peter David, and Robin Furth.

Stephen King's The Dark Tower: Beginnings: The Complete Graphic Novel Series
The Battle of Jericho Hill
Stephen King's The Dark Tower: The Gunslinger: The Complete Graphic Novel Series
La Torre Nera: Le piccole sorelle di Eluria
Lady of Shadows
The Sailor