book cover of My Sister is Going to Kill Me
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My Sister is Going to Kill Me

(2026)
A novel by

 
 
From the New York Times bestselling author of the runaway hit Mother-Daughter Murder Night, a Reese’s Book Club pick, comes another fun, family-centered whodunnit about two sisters who work together to find a killer as they raft down the rapids of the Grand Canyon.

What's a family vacation without a little murder?

Liv and Mandy Chisholm’s yearly sister trip is a sacred tradition, an attempt to bond as their lives increasingly diverge. Liv, the ever-practical older sister, packs the color-coded itineraries. Mandy, a bedazzled human tumbleweed, brings the spontaneity.

This year, the sisters take off for a rafting adventure through the breathtaking depths of the Grand Canyon with a group of strangers. But beyond the terrors of whitewater rapids, sibling squabbles, and rogue reptiles, the ferocious beauty of the river carries a darker undercurrent, and an unexpected guest: a murderer in their midst.

When a fellow traveler is found dead and another corpse hits the water, the rafting trip flips from idyllic sister vacation to high-stakes murder investigation. Every suspect has a secret, every clue is drenched in mystery, and Liv and Mandy can hardly trust each other, let alone their own instincts. With the river raging and danger around every bend, the Chisholm sisters must work together to catch a killer—and keep their relationship from capsizing—before it’s too late.


Genre: Mystery

Praise for this book

"My Sister Is Going to Kill Me has all the tension and danger of a locked-room mystery set in the wide-open expanse of a wild and unpredictable landscape. A captivating and entertaining read." - Elle Cosimano

"The perfect mix of adventure, suspense, and murder mystery, with the bonus of a spectacular setting. I was immediately sucked in by this pulse-pounding journey of two polar opposite sisters rafting in the Grand Canyon, and Nina Simon expertly crafts a cast full of unforgettable suspects while carefully balancing the drama of sisterhood. This mystery will completely transport you." - Kristen Perrin

"A high-octane thriller about two sisters who have to solve a murder ... or die trying. Propulsive and page-turning, this is armchair adventure at its best." - Nita Prose


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