My Sister Is Going To Kill Me

My Sister Is Going To Kill Me by Nina Simon is a Mystery release out on August 18, 2026.

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My Sister Is Going To Kill Me

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My Sister Is Going To Kill Me Release Date: August 18, 2026

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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.

Liv and Mandy Chisolm’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. As they set out for this year’s trip, a rafting adventure through the breathtaking depths of the Grand Canyon with a group of strangers, they hope to revitalize their relationship. 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 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.

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Genre: Mystery

Nina Simon

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