Merlin and Arthur are sent on a dangerous mission to capture the Cup of Life, a powerful magical artifact that carries the gift of immortality. Before they can retrieve the Cup, they are captured by the unscrupulous slave trader, Jarl.
Her distant past leaves Magnus fighting for her life in an old, abandoned building. And, in order to ensure the safety of Hollow Earth, she must make a deal with the devil – a devil who appears to have come back from the dead to threaten her present – and future.
Brennan and Booth investigate a crime scene where a human carcass has melted to the dashboard of a charred truck; Sweets tries to keep his feelings for Daisy from interfering while helping her pass a government psychological evaluation.