A teenage girl has vanished in Santa Fe. Nearby, in the Trappist monastery of St. Mary of the Snows, a beautiful young nun is stabbed to death. Father Nicholas Fortis is on sabbatical at St. Mary's, and when Lieutenant Christopher Worthy of the Detroit Police Department is flown in to help find the missing teenager, the Orthodox monk asks his friend to delve into the nun's murder as well. The two men make a perfect team: the monk's gregarious manner opens hearts and the detective's keen intuition infiltrates psyches. The Book of Matthew refers to the "narrow gate" that leads to heaven....