Andy Davidson asks Gwen to look into the disappearance of a teenaged boy named Jonah Bevan, seven months earlier. Surveillance footage depicts him vanishing into thin air, and Jack arriving on the scene less than an hour later. However, Jack insists that it's just a coincidence, and that he doesn't know what happened to Jonah. Gwen is prepared to abandon the investigation, but Andy convinces her to meet Jonah's distraught mum, Nikki. Through Nikki, she uncovers an epidemic of missing persons in the Cardiff area -- and the Rift seems to be the cause. But, if so, why is Jack so adamant that Gwen stop looking for Jonah?