2014 год. Rex lives on Tower Green, and likes nothing better than sniffing around in juicy litter bins. But one day, the stinky bin he's rummaging in turns out to be a time machine! It takes him back to the Tower of London of King Charles II, where Rex meets spoiled lapdog Cavalier, explores the old Tower and even gets to see the Crown Jewels. But while he's admiring the crown, orb and sceptre, thieves burst in and steal them away. Can Rex save the day?