While chasing a man, Gwen retrieves an unusual machine that allows the user to see back into the past. When she inadvertently uses the machine, she is haunted by a vision of a lonely young boy during World War II Britain. Considering the machine dangerous, no members of Torchwood are permitted to use it. But Owen has other plans, and witnesses a violent murder that took place over forty years ago. Using the information he gathered, Owen starts to track down the still-living murderer.