Last night the thieves searched the house. They took three valuables and hid them behind the secret door. At midnight they will return to collect their booty. We are a detective team, assigned to prevent the theft! We will try to find out what valuables the thieves want to steal. If we succeed before the clock strikes 12, we can outsmart the thieves. ‘The Secret Door’ is an exciting memory game. It is important to know which valuables are where. The children help each other to remember what they have discovered.