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Giant battle robots! Cotton candy betrayal! Blasts from the past! And the ultimate challenge to stay true to themselvesandeach other await Theo and Alexander in thefinalbook in the tragic series about the Sinister-Winterbottom twins, who must solve one wretched mystery after the next, brought to you by #1NYTbestselling author Kiersten White.Trapped in Aunt Saffronia’s spectral house, Theo and Alexander must work together to escape, stop their newfound nemesis Essa and her henchman Edgaren’t, save Wil and their friends, find their parents, and maybe, just maybe, get things back to normal.Following the clues left behind, the twins find themselves at Siren’s Song Seaside Amusement Park. Old faces and new surprises await them in a park that was built to lure in visitors…and their secrets.As they get closer to answers, the twins are left with the biggest question of all: Who is Essa really, and why is she so determined to find their parents?

From the #1 New York Times bestselling and Bram Stoker Award-winning author of And I Darken comes an atmospheric dark fantasy thriller about one girl's mission to rescue her sister and her ensuing quest into the terrible secrets of her tyrannical country and the House that beats like a red, bleeding heart at the center of it all.No one knows exactly what goes on in the House of Quiet.It’s said to be a place for children with whom the Procedure has gone wrong, a place to quiet their terrible powers.After years of bargaining, threatening, and spying, Birdie has finally found a way into the House where she’s long suspected her sister—sold to the Procedure seven years ago—is being held.Nothing is what she expected. All the children appear to be boringly human, especially silent, mesmerizing Forest, who doesn't speak. Her fellow maid, Arrow, is meek and obedient, like Birdie. Isn't she?Birdie has been prepared to do whatever it takes to find her sister, but as she digs deeper into the secre

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