Meet the Sinister-Winterbottoms.
Their summer is about to get…spooky.

Meet the Sinister-Winterbottoms: brave Theo, her timid twin, Alexander, and their distracted 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. 

But each vacation destination the Sinister-Winterbottoms visit deepens the mystery of where—and who—their parents are. Armed with cleverness, resolve, and kindness, Theo and Alexander are determined to out-Sinister their summer, solve every mystery, and be reunited with their family. Can their twin bond withstand large mean mustaches, terrifying wave pools, personality-altering summer camps, and electrifyingly spooky manors?

Get ready for a summer vacation like no other…

  • “Wickedly weird. . . . Will appeal to anyone who loved A Series of Unfortunate Events.”

    The New York Times

  • “An absolute delight. If I have to die in a waterpark, I want to die in this one.”

    Holly Black
    #1 New York Times bestselling author of The Cruel Prince

  • "Packed with wordplay and mock-gothic mystery, this first title in the Sinister Summer series is perfect for fans of Lemony Snicket, Edward Gorey and Roald Dahl."

    Shelf Awareness

  • "The creepy gothic setting, the relationships between the siblings, the cast of unusual characters, and the teasers that this episode is just one part of a much larger puzzle will keep readers hooked. Young goths will be all-in for the trippy mysteries."

    Kirkus Reviews

  • "Readers who enjoy quirky mysteries will fall in love with the clever and relatable Sinister-Winterbottom twins."

    Booklist