Radish and Stefy’s father punished them by forcing them to stay home and study maths. However, they skip the punishment to help their Grandpa, as someone has tricked him and run away with his money. It turns out to be a school friend of their parents, Mr. Lehman. The investigation led by Charly & Co. involves Fred’s Mum as an undercover agent to trick on Lehman! However, the smokescreen does not work and they find themselves interfering in previous police investigations.
