Father O'Brien is a tough Catholic priest with a violent past. He now counsels youth in prison and has a particular interest in two brothers behind bars. He becomes their advocate on the pretext of rehabilitation, visiting them regularly and eventually getting the boys released into his care. DCI Keir Dickson, the man who put these brothers away for eight years, is furious. He sends DS Liam Smith undercover to see what this priest and these ex-cons are up to. It turns out the father has given the boys an intriguing assignment. Every month, they drive a Volvo to an orphanage in Holland with food and clothes, driving a supposedly empty car back into England. The brothers soon realize their car is not empty on the return trip, and this realization puts them in grave danger. Smith, along with the rest of New Scotland Yard, must deduce Father O'Brien's plan and hopefully divert a disaster.