Lieutenant Bradley Heap has gone AWOL and taken along his wife and son. They're managing to cope until a chance encounter turns their world upside down. With no money and no contacts, the Heaps are forced underground. It's a tough path they've chosen, but they can cope with anything as long as they stay together as a family unit. Detective John Locke of Police Scotland joins forces with his Navy colleagues in the search for Heap on a trail that will...