Melanie Marsh is an American living in London married to Stephen, who knew the minute he saw her that she was to be his future. But when their youngest child is diagnosed with autism their marriage starts to unravel. Stephen runs back into the arms of his former girlfriend while Melanie does everything in her power to help her son and keep her family together. And then one day Melanie hears about a man named Andy O'Connor, who calls himself a "play therapist" and has a client list so long she can barely get him on the phone. Some say he's a maverick and a con artist, but when he walks into the house and starts playing with her child, Melanie knows she's found the key to her son's success, and possibly to her own happiness...