S1, E2: The mice are visiting their cousin Agatha and looking forward to attending Queen Victoria's Golden Jubilee celebration, but there's trouble apaw when they discover that the diamond in the Queen's crown has been stolen! Agatha is afraid her best friend Molly's mum, the Queen's maid, will be accused of the theft. With a little help from Rathbone the Rat, a reformed safe cracker, the mice discover the thief is actually Maggie the Magpie who just can't keep her claws off of shiny objects!