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Threshold is a 6-book series with 4 primary works first released in 2012 with contributions by Christa Kinde, Peter Clines, and Keith Giffen.
2013 • 1 Reader
2012 • 206 Readers • 469 pages • 3.9
2015 • 196 Readers • 3.8
Dead Moon
2019 • 36 Readers • 400 pages • 3.6
Angels in Harmony
2014 • 42 Readers • 4