Isle Of 100000 Graves

the long version

"Five years ago, little Gwenny's father found, inside a bottle, a map with instructions on how to reach the mysterious Isle of 100,000 Graves and its legendary treasures-- and then he vanished. Now Gwenny, having stumbled across another bottle-shipped map, enlists the dubious help of a shipful of pirates, sets out to find the island, and her long-lost dad. Little does she realize that the Isle comes by its ominous name honestly, as the location of a secret school for executioners and torturers, where apple-cheeked youngsters are taught the finer points of extracting information from prisoners-- and then putting an end to their lives in a wide variety of gruesome ways. And they've reached the point in their studies where theory should ideally give way to practice, so an influx of uninvited visitors comes as a blessing to the faculty. And yes, this story is a comedy. Albeit a dark one" -- from publisher's web site.