The Squirrels are excited to go to a black-and-white gala at King Tiger's house. On arrival, they're impressed with King Tiger's party crown and its resplendent red ruby centrepiece, even if his composure is somewhat ruined by frequent and giant sneezes.\n\nThe Squirrels set about testing out Duggee's golden rules for party etiquette by mingling with fellow guests but get a suspiciously lukewarm response. When King Tiger suddenly cries out that his ruby has gone missing, the party turns into a mystery to be solved. Luckily, Duggee has his Mystery Badge!\n\nThe Squirrels gather everyone together to examine the evidence of their suspicious behaviour and narrow down the list of potential culprits to... King Tiger! Or rather to his giant sneezes, which made the ruby come loose and fly into a trifle. King Tiger is reunited with his ruby, the Squirrels get their Mystery Badges, and everyone gets to eat the trifle!