It is all go at the Solana as Mateo prepares for his first water aerobics class, but when Donald takes a funny turn in the pool, Mateo finds himself in a spot of bother and has to ask Les/Lesley for help. The Garveys get a shock when they are approached by a gangster who tells them that they have inherited Mel Harvey's debt, and they attempt a very risky bet to pay off what they owe. Noreen's problems with Pauline continue.
An interplanetary war is announced, and the key to salvation is held by Rose's mum and boyfriend.
Andy tries to give Maggie some advice on how to avoid acting racist around super-cool superstar Samuel L. Jackson. Maggie returns the favour by helping Andy to avoid the most boring stalker in the world.
Adrian Fell, a highly respected and sharp-witted police officer, is connected to the death of a barrister when a reporter witnesses the officer at the scene of the crime, seemingly staring at the body and stealing evidence. It is then up to Jonathan to find out if he is, in fact, a ruthless killer, and what sinister secret is contained within Fell's strange chequered box.