Rob enters the familiar cold room and freezes. Cassie is lying dead on the slab, naked, with a stab wound on her chest, her eyes open and staring. He turns to the left and sees Cassie, the real one, standing next to Sam, looking paler than usual.
"Cassie," he whispers, quickly crossing over to hug her. He can't bring himself to look at the dead girl again. Cassie had told him on the phone that the victim looked just like her, but he hadn't thought she meant literally. He hears Sam saying to Cooper, "Can we cover her up?" Cooper covers the girl with a blanket.
"So what have we got here?" says Rob, having recovered slightly from the shock.
"A Jane Doe, using Maddox's old undercover identity," says Mackey cheerfully from the corner. "Probably someone Maddox knew back then mistook our girl for Lexie, and she went along with it."
"It's uncanny, the likeness," says Cooper, still looking at the girl's face. Rob doesn't look in his direction.
"Mackey's got a plan," says Sam, speaking directly to Rob. "He wants to pretend Lexie — or whoever she was — is still alive. He wants Cassie to go undercover again."
"I haven't agreed yet," says Cassie quickly.
"It's madness. Will you tell her?" says Sam. He must be desperate if he's appealing to Rob.
"There's no way Maddox could pass for Lexie," says Rob, shaking his head seriously. "Lexie was pretty."
There's a moment of shocked silence where everyone stares at him, then Cassie bursts out laughing and punches him in the shoulder. "You bastard," she says, wiping her eyes. "I knew I asked you along for a reason."
"When you two have finished your double act, can we get back to business?" says Cooper. Rob nods and squeezes Cassie's shoulder, privately thinking that she'll go undercover as a murder victim over his dead body.