Lucy urgently needs help! Her boyfriend has been behaving very strangely for some time. She senses that he's hiding something from her, but she just can't get anything out of him. He's locked up like a living safe! The three ??? do their best. They observe Lucy's boyfriend and secretly start their detective work. Does his behaviour have something to do with an accident? Has he lost his memory? Is it about money or fraud? Justus, Peter and Bob investigate in all directions. An exciting case with many challenges for the detectives from Rocky Beach. Together they unravel the mystery!