98-year old Grandfather wanders into a strange pub, unaware that a group of mischievous robbers, led by the terrible Lotrando, have their headquarters there. At first they make fun of Grandpa, but eventually they realize what an adversary they have in him. With the help of Sherlock Holmes and Léon Clifton, Grandfather manages to hold off the robbers. Grandfather has only one concern - what Grandmother might say to his late arrival.—EuroFan