Present-day California. Robin Hood’s days are long over, but just like him, the Longfinger family has for centuries been stealing from people who have too much money.
Lucy is such a talented thief that the dreaded gangster boss King Ratto wants to force her to work for him now – otherwise, Ratto threatens, he will feed Lucy’s parents to his piranhas. He sets her a deadline for her 13th birthday – which is only 10 days away! While Lucy is frantically looking for a way out, the Secret Service appears and leaves mysterious messages for her all over the city. Luckily, there is also Toni Morelli, a boy Lucy met at the ice cream parlour. He shares her love for the ice cream flavour Mango-Chili and does not easily lose track of things, or even of a master thief …