Sisters Mary Jo Brunetto and Gabriel Schmidtzer stumble upon an apparent crime scene when they discover Saint Malachi's Church unlocked and brightly lit in the middle of the night. Father Sergei Yerkhov, a visiting priest at Saint Malachi's, has gone missing and there's blood on the handrail leading from the church. Gabby's imagination runs wild with possibilities. Detective Cassandra Meade knows she's in for trouble when Gabby and Mary Jo—two nosy nuns—launch their own investigation.