Back on the job after a stint in rehab, US Postal Inspector MC McCall is assigned to mentor an unseasoned young inspector while trying to tune out her demons. The challenge is to stay sober and deal with the Columbo-loving newbie. Then MC is sent to Castle Cove, Minnesota, to investigate a post office robbery, which turns into something much worse. McCall must navigate the grief and guilt of her personal loss while fighting furiously to reel in degenerates preying on children and profiting from peddling illegal images. Will MC succeed in taking down the twisted predators without taking a nosedive back into the bottle? A firm believer in never giving up, MC must persist while learning how to let others in if she wants to survive.