5 books in series

John Dies at the End

John Dies at the End is a 5-book series with 5 primary works first released in 2007 with contributions by David Wong and Jason Pargin.

John Dies at the End
John and Dave and the Temple of X'al'naa'thuthuthu
This Book Is Full of Spiders: Seriously, Dude, Don't Touch It
What the Hell Did I Just Read: A Novel of Cosmic Horror
If This Book Exists, You're in the Wrong Universe