Ties That Bind

Armed robbers are targeting post offices around Aidensfield, leading to Mason working with his old flame Rachel Dawson. Her career meanwhile is in doubt, following being in an affair with a senior colleague. Carol isn't overly impressed when she spots Joe in a romantic clinch with Rachel, who denies this and says it was in the line of duty and nothing guilty. Meanwhile, Peggy offers to house clean for a man. Oscar thinks she is after the man's money. However, it is the man's wife, who is a resident in a nursing home, who has a shady past.

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S18E19 - Deadlier Than the Male