Enigma (Paperback) (ISBN-13: 9781735079813)

When twenty-one-year-old Dominic is persuaded to rescue a young girl from the underground tunnels of Wupatki, the two find themselves lost in a strange realm of celestial enigmas, riddles, and otherworldly creatures. Failure to solve the riddles will lead to self-destruction, and even if they succeed, they risk unleashing a powerful demon on their own world. Enigma is the first book in a trilogy, followed by Eridanus and The Secret of Ophiuchus.