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My Sister is Going to Kill Me

A Novel
Brief Description
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-centred whodunnit about two sisters who work together to find a killer as they raft down the rapids of the Grand Canyon. What's a... Read More
Format: Paperback / softback
$3699
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Releases 29th September 2026 (Approx. Date) Pre-order  "My Sister is Going to Kill Me" now to secure your copy from our first shipment

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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-centred 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 colour-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 traveller 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.

Book Details

INFORMATION

ISBN: 9780063583719

Publisher: HarperCollins Publishers Inc

Format: Paperback / softback

Date Published: 29 September 2026

Country: United States

Imprint: HarperCollins

Audience: General / adult

DIMENSIONS

Weight: 0g

Pages: 352

About the Author

Nina Simon has worn many hats: NASA engineer, slam poet, mystery game designer, museum director, and global nonprofit founder. She is an Ashoka fellow and the founder of OF/BY/FOR ALL, a global nonprofit that creates digital tools to help civic and cultural organizations become more inclusive, relevant, and sustainable. Nina is an in-demand writer and speaker about community participation in museums, libraries, parks, and theaters. Her work has been featured in the Wall Street Journal, New York Times, NPR, and on the TEDx stage. Born and raised in Los Angeles, Nina now lives off-the-grid in the Santa Cruz mountains with her husband and daughter. Mother-Daughter Murder Night is her first novel.

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