S11·E91 Normal Behaviour

Greig and Croft investigate when an elderly homeowner is attacked and robbed after returning home from holiday. Her description of the suspect matches local thug Liam Bowen, but Bowen's mother provides him with an alibi for the time of the attack. Later, the home of a school caretaker is ransacked and damaged, and Greig and Croft discover that the school is once again connected to none other than Liam Bowen.