The author of the book ‘The Other Key’ is C.A. Varian. ‘The Other Key’ is the 2nd book in ‘The Other World’ series. The story is about Zoe Lawson, who used her enchanted key to enter the fae world of Ecromos for a cancer cure. In the story, she was captured to trade human women for breeding and sexual slavery. It falls under genres like Fantasy and Paranormal.