Firelight (Amulet #7)

A hidden past ... and a deadly secret. Emily, Trellis and Vigo visit Algos Island, where they can access and enter lost memories. They’re hoping to uncover the events of Trellis' mysterious childhood–knowledge they can use against the Elf King. What they discover is a dark secret that changes everything. Meanwhile, the Voice of Emily’s Amulet is getting stronger and threatens to overtake her completely.