InterWorld is a 3-book series with 3 primary works first released in 2007 with contributions by Neil Gaiman, Michael Reaves, and Mallory Reaves.
2007 • 76 Readers • 265 pages • 3.6
2013 • 16 Readers • 256 pages • 3.5
2015 • 10 Readers • 288 pages • 4