She thought she'd buried her past. But what if it's been hunting her this whole time?

From the bestselling and award-winning author of The Marsh King's Daughter comes a startling novel of psychological suspense as two generations of sisters try to unravel their tangled relationships between nature and nurture, guilt and betrayal, love and evil.

You have been cut off from society for fifteen years, shut away in a mental hospital in self-imposed exile as punishment for the terrible thing you did when you were a child.

But what if nothing about your past is as it seems?

And if you didn't accidentally shoot and kill your mother, then whoever did is still out there. Waiting for you.

For a decade and a half, Rachel Cunningham has chosen to lock herself away in a psychiatric facility, tortured by gaps in her memory and the certainty that she is responsible for her parents' deaths. But when she learns new details about their murders, Rachel returns, in a quest for answers, to the place where she once felt safest: her family's sprawling log cabin in the remote forests of Michigan's Upper Peninsula.

As Rachel begins to uncover what really happened on the day her parents were murdered, she learns--as her mother did years earlier--that home can be a place of unspeakable evil, and that the bond she shares with her sister might be the most poisonous of all. One of Publishers Weekly's Best Suspense Books of 2020

"A gut-clenching wilderness thriller."--Minneapolis Star Tribune

“[A] neo-gothic psychological thriller that’s a true mind-bender...’The Wicked Sister’ brings to mind those classic Bette Davis quasi-horror flicks ‘Whatever Happened to Baby Jane?’ and ‘Hush, Hush, Sweet Charlotte.’ Dionne has fashioned a superb character study of murder and madness that reads like Alfred Hitchcock at his best in book form.”--Providence Journal

"Dionne paints a haunting portrait of a family hurtling toward the tragic destiny they can foresee but are powerless to stop."--Publishers Weekly (starred review) 

“The Wicked Sister is massively thrilling and altogether unputdownable. Dionne is proving to be one of the finest suspense writers working today.”–Karin Slaughter, author of 20 International Bestselling Books

“A terrifying thrill-ride of psychological suspense. Karen Dionne is wickedly good at deception, deceit and misdirection and The Wicked Sister is seductively compelling. You will not stop reading.”
--Robert Dugoni, New York Times Best-Selling Author of My Sister’s Grave

"In Karen Dionne's wilderness, humans are the most dangerous animals of all. The Wicked Sister is enthralling and terrifying, and I couldn't put it down.  A terrific novel."--Joseph Finder, New York Times bestselling author of House on Fire

“A chilling portrait of a psychopath that will shock and fascinate you. Dionne is a master storyteller who has crafted a terrifying thriller that will haunt you long after the last page is read.” --Liv Constantine,  bestselling author of The Last Mrs. Parrish

“Chilling and captivating, The Wicked Sister explores the complex layers of family bonds, guilt, and redemption. A beautifully written, haunting psychological thriller.”—Megan Miranda, author of All the Missing Girls

“Karen Dionne is back with a dark, atmospheric and chilling tale set in the deep woods of Michigan’s Upper Peninsula. Beautifully written, The Wicked Sister moves seamlessly between past and present, unraveling the truth behind a family tragedy. From her insightful depiction of both the grace and bitter cruelty of humanity, to her command of the plot and pacing, Dionne’s brilliance shines through on every single page. Prepare to be blown away!”--Wendy Walker, bestselling author of The Night Before

"Fresh, truly original, and utterly unpredictable, Karen Dionne is at the top of her game with the gorgeously told The Wicked Sister. I devoured this book in one sitting! It's hard to balance complex and heartrending familial relationships with pulse-pounding suspense, but somehow this book does exactly that. Propulsive and terrifying to the very shocking end!"--Kate Moretti, New York Times bestselling author of The Vanishing Year

Karen Dionne does a masterful job of creating a mystery with plenty of twists…This is a must-read for mystery fans, or anyone with an interest in UP Michigan.”--Faribault Daily News