Lulu is very excited. Her aunt is getting married and she is going to be a bridesmaid. Unfortunately she eats a bit too much chocolate and the next day is too ill to go to the church. In her family's absence, she has a fantastic chocolate-fuelled adventure, shrinking to the size of a mouse and joining the sugar bridegroom from her aunt's wedding cake in a dramatic rescue of his blushing bride from the clutches of some gangster mice. Helped by Willy's chocolate soldiers, Lulu's chocolate kittens and a discarded slice of beetroot, they manage to rescue the bride and scramble back onto the cake before the wedding guests arrive. Lulu wakes up feeling much better and joins in the party, wondering whether it was all a dream . . .