The Case of the Smuggler's Curse: The After School Detective Club: Book One - Mark Dawson - Bog

"They may seem an unlikely gang of friends, but when they spot a ghostly figure walking the beach one winter's evening, they are thrown together to unravel a mystery that none of them expected. The deeper they dig, the bigger the adventure becomes--motorboats, tracking devices, bedroom breakouts, and daring sea rescues are all in a day's work for the After School Detective Club"--