Lost & Found - S12.E42

Amy initiates a deadly game of cat and mouse with the accused doctor. Despite Jonesy's warnings, she accepts a lunch invitation only to discover the he has a son with Downs Syndrome and doesn't appear to be quite the monster she had imagined. Amy traces the boy's mother and uncovers the doctor's first victim, but just as she is about to put the doctor away, he again turns the table on her.