Connor's grandad has gone into an experimental bungalow run by caring robots. But Nurse Bot, the robot in charge, starts to become alarmingly bossy and ends up imprisoning Grandad in the bungalow. Determined to find out who is behind the robots, Connor and his friend Simon track an injured robot to a nearby warehouse where they discover a mad scientist who has modelled the Nurse Bots on his old nanny - a bully who obviously hated children. Can Connor and Simon outwit Nurse Bot and rescue Grandad? Yes, with the help of Simon's sister - did I say she was a were-weasel?