An anti-social sound designer with retrograde amnesia discovers a string of murders in his building but when the carnage triggers memories of his mysterious past, he races to stop the killer before losing those he loves most.

A Las Vegas casino magnate, determined to find a new avenue for wagering, sets up a race for money.

In the fourth outing for the vacation franchise, the Griswolds have to survive Vegas fever when they go to Las Vegas for a fun family vacation.