Finally settled nicely in the Brown home and boarding house at Windsor Gardens, generous and popular, bear Paddington is delighted with a visit form his aunt and second mother Lucy, and decides to earn her a centennial birthday present. As she admires London, he goes for a unique pop-up book of the City in Mr. Gruber's antique shop. However it's stolen with him set-up, arrested and jailed, ignoring it's the secret key to a fortune in robbed jewelry. In prison, Paddington becomes popular as the incompetent but well-feared trustee cook's assistant, and ultimately is helped to escape. The Browns set out to find the real thief, which is their own gentleman guest Phoenix Buchanan, a suave actor and trickster, who will fight them and Paddington all the way to the treasure.—KGF Vissers