DI Cullen leads a drugs raid on a warehouse owned by his old nemesis, Terry Barlow, but finds nothing. Cullen is furious with DC Glaze, whose snout tipped them off about drugs on the premises. PC Harker and PC Rickman deal with a domestic case involving an argumentative couple, the Carters, and their baby. Neither case makes any progress until a neighbour reports that Barlow has been to visit the Carters on several occasions. Determined to get one up on CID, Harker puts the pieces together and comes up with a theory that the Carters are putting their baby up for sale on the Guatemalan black market with the help of a doctor at St Hugh's, and Barlow is the broker. Despite warnings from Glaze, Harker presses on and is proven correct when they raid a hotel where the exchange has taken place. Baby Sean is recovered, and the police race to an office building where Jackie Carter is threatening to kill herself.