Lucy, Max, Charlie and Joe aren't looking for new friends they have too many of their own problems to worry about. But when the four of them, and Charlie's faithful dog, Sherlock, spot a phantom figure on Southwold beach one winter's night, they are thrown together to unravel a mystery that none of them expected.The deeper they dig, the bigger the adventure becomes - motorboats and tracking devices, bedroom breakouts and daring sea rescues are all in a day's work for the After-School Detective Club. But when their investigations lead them into trouble with the police, there is only one thing left to do - they must go undercover for a final showdown with a ruthless gang of smugglers who will stop at nothing to get what they want.