"New York City, late September 2001. The walls of the city are papered over with photos of the missing. Cora Brady's father is there, the poster she made taped to columns and bridges. When a letter arrives from an aunt she didn't know existed in Ireland with the offer of a new life, the name jogs a memory: an old videocassette game Cora used to play as a child where two sisters must save the students of a mysterious boarding school. County Donegal,...