Emmett and Kami have always been best friends, but Emmett has been keeping secrets. His past catches up with him when a dark fae known as the Erlkr nig chases them into the realm of Mythos. In this strange world, Kami finds herself with the ability to know when people are lying and she knows that everything Emmett has ever told her was a lie - even his name.

Emmett needs Kami to trust him enough to get her back to safety. It's a fine line to walk between lies and truth, and the dangerous journey ahead will put their friendship to the test. As the Erlkr nig closes in on them, the web of lies Emmett has built begins to unravel and Kami demands the truth - a truth that will shake the foundations of everything she ever believed.