My Sister Is Going to Kill Me: A Novel

From the New York Times bestselling author of Mother-Daughter Murder Night comes a thrilling family-centered whodunnit. Two sisters, Liv and Mandy Chisholm, embark on their annual bonding trip, this year a rafting adventure through the Grand Canyon. Amidst the challenges of whitewater rapids and sibling dynamics, they find themselves in the midst of a murder investigation when a fellow traveler is found dead.

As another body surfaces, their idyllic vacation transforms into a high-stakes mystery. With secrets among the group and danger lurking around every bend of the raging river, Liv and Mandy must rely on each other to catch a killer and salvage their relationship.

Key Features:

• A propulsive and page-turning mystery set against the backdrop of the Grand Canyon.
• Features two sisters working together to solve a murder during a rafting trip.
• Explores themes of family bonds, secrets, and trust.

Specifications:

• Author: Nina Simon
• Binding: hardcover
• Language: English
• Print Length: 352 pages
• Publisher: William Morrow
• Publication Date: September 10, 2026
• ISBN-10: 0063478021
• ISBN-13: 978-0063478022
• Item Weight: 472 g
• Dimensions: 25.4 x 5.08 x 6.86 cm

Join Liv and Mandy as they navigate treacherous waters and uncover the truth in this suspenseful mystery.