In the bustling heart of London, Tabby McTat (Sope Dirisu), a singing cat, and his busker friend Fred (Rob Brydon) entertain passing crowds, and the pair are 'purrrfectly happy'. One day, while Tabby McTat takes a stroll, he stumbles upon a friendly feline named Sock (Susan Wokoma). Then fate takes an unexpected turn when a thief steals the buskers' hard-earned money.