When Hazel Mansfield's baby is abducted from outside the post office, Craddock believes it is connected to a break-in at a mother and baby home called Moorside Lodge, where Hazel adopted baby Peter. Craddock calls for reinforcements and Mike is tasked with tracking down Peter's biological parents. As a wide search gets underway, time is against them as Peter is seriously ill and will not survive without medication. Meanwhile, Greengrass receives a shock when David leaves his "employment" to find a full-time, paying job. Greengrass recruits mechanical whiz Gary Clarkson to help him lay out driveways with concrete. For once, David may be right when he voices his suspicions of Gary, and Greengrass may live to regret ignoring his sidekick.