A chemical plant is attacked which threatens to contaminate a water source. Saga realises living with a partner is harder than she thought. Martin looks into Saga's past.
Martin visits Jens in prison and seems to be getting to him. As they re-interview witnesses Saga suspects a statement has been tampered with. Laura regains consciousness and remembers what her assailant looks like.
Saga and Martin have a sketch of the suspect, but can they get to them in time to avert 'The Graduation'. Their friendship is placed under strain by Martins inquiry into Saga's past.