Rosie is viciously attacked while attending a broken-down vehicle stranded on the moors. When the murdered driver is discovered nearby, Rob and Rachel are determined to solve the mystery when it becomes apparent that the driver was a retired cop turned private detective. Their investigation leads to a chilling discovery linking the case to a religious cult near Aidensfield. Meanwhile, Aunt Peggy buys a flock of turkey's off an old friend, but fails to make any money from them when David grows attached, whilst Carol isn't happy when Rob cancels their first date.