In the underground Fae realm, only the strongest and most ruthless have power-but a young human woman forced into a life of servitude is about to change everything.

Kenna Heron is best known in her village for being a little wild-some say "half feral"--but she'll need every ounce of that ferocity to survive captivity in the cruel Fae court.

Trapped as a servant in the faeries' underground kingdom of Mistei, Kenna must help her new mistress undertake six deadly trials, one for each branch of magic: Fire, Earth, Light, Void, Illusion, and Blood. If she succeeds, her mistress will gain immortality and become the heir to Earth House. If she doesn't, the punishment is death-for both mistress and servant.

With no ally but a sentient dagger of mysterious origins, Kenna must face monsters, magic, and grueling physical tests. But worse dangers wait underground, and soon Kenna gets caught up in a secret rebellion against the inventively sadistic faerie king. When her feelings for the rebellion's leader turn passionate, Kenna must decide if she's willing to risk her life for a better world and a chance at happiness.

Surviving the trials and overthrowing a tyrant king will take cunning, courage, and an iron will... but even that may not be enough.