Shade in the Stone

Evan Foster and Henry Ford dig up an ancient silver goblet in Henry's backyard. Evan also spots an amulet, and decides to secretly keep it himself. But the amulet begins to take Evan over, and the Powers team are sent in to pick up any clues as to why Evan has been acting strangely. The team discover that Evan has to put the amulet back together with the goblet and bury them, with bones also dug up in Henry's backyard, in the exact same spot they were dug up in!