A Game For Two Players - S1.E9

The episode opens with a young boy standing by the side of the road, trying to hitch a lift. Rupert stops and picks him up. Because the boy doesn't have a specific address that he's trying to get to in York, Rupert takes him back to the flat and Amy. The boy, a Londoner, tells Rupert and Amy that he's looking for his mother who left home with a strange man, crying as she went; and later sent him a postcard of York Minster. Amy takes the boy under her wing while Rupert tries to find his mother.