A middle-grade mystery series that's spooky, creepy, and filled with gothic twists!Meet the Sinister-Winterbottom twins, who solve mysteries at increasingly bizarre summer vacation destinations in the hopes of being reunited with their parents—or at the very least finally finding a good churro.“An absolute delight. If I have to die in a waterpark, I want to die in this one.”—Holly Black, #1New York Timesbestselling author ofThe Cruel Prince"Wickedly weird. . . . Will appeal to anyone who loved A Series of Unfortunate Events."—The New York TimesMeet the Sinister-Winterbottoms: brave Theo, her timid twin, Alexander, and their older sister, Wil. They’re stuck for the summer with their Aunt Saffronia, who doesn’t know how often children need to eat and can’t use a smartphone, and whose feet never quite seem to touch the floor when she glides—er—walks.When Aunt Saffronia suggests a week pass to the Fathoms of Fun Waterpark, they hastily agree. But the park is even stranger than Aunt Saffron
