A mysterious signal lures the USS Voyager to an uncharted sector of the Delta Quadrant – and an enigmatic ghost ship floating adrift in space. Janeway mounts an investigation, hoping the alien ship may hold a clue to the whereabouts of the Caretaker's long-lost ship and his mate – the only known entity to have the power to send the USS Voyager home. The ghost ship appears deserted, but soon a strange presence casts an eerie spell over the hearts and souls of the crew. Unless Janeway can solve the vessel's mystery, Voyager itself may succumb to its haunting song…