1x1 - In the Dark

As DI Helen Weeks grapples apprehensively with pregnancy, she is compelled to return to her loathed rural home town of Polesford, Derbyshire. Two girls have been abducted, and the man arrested is married to Helen's childhood best friend, Linda. But is he guilty? And why is Helen so desperate to come to Linda's aid after avoiding Polesford for all these years?