A police convoy escorting a civilian under a witness protection scheme is attacked; the witness hospitalised; all three police officers are killed, except Inspector Lindsay Denton, who organised the operation at very short notice and who only informed DCC Dryden. Ted Hastings asks Steve and Kate to interview her but Kate pulls out because she and Jayne Akers, one of the dead officers, trained together—though she has been having an affair with Jayne's husband Rich. Her place is taken by Georgia Trotman, who is troubled that the men are treating Lindsay as a suspect and delving into her finances. Lindsay is transferred to a missing persons unit. Kate follows her to the nursing home where her mother lives and learns she has rung the hospital from a payphone. Georgia and Steve race to the hospital where somebody is killing the witness. Steve is rendered unconscious; Georgia is pushed out of the window to her death.