book cover of Warning Signs
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Warning Signs

(2026)
A novel by

 
 
‘Nerve-shredding. . . . What could have been a pure tale of icy survival is enhanced by [Sierra’s] thoughtfulness.’ —The New York Times

‘The tension, the atmosphere, the dread . . . This is a book that sticks in your head long after the last page.’ —Lisa Jewell

The heart-stopping second novel from the author of
Nightwatching, in which a father-son ski weekend becomes a desperate fight for survival

Twelve-year-old Zach is cautiously optimistic. His father Bram, whose business is in dire need of cash, has put together a father-son backcountry ski weekend to wine and dine his biggest investors. Schooled in outdoor survival by his mother, Zach is eager to prove himself to the hypercritical Bram. Maybe if Zach shows how useful he is, he can earn his father’s love.

But Zach knows to be on high alert around Bram, and he sees the way the group ignores the increasingly threatening conditions. For the first time in his beloved mountains, he is faced with the unknown, convinced that something watches their cabin from the treeline. Something that leaves behind strange tracks and picks its prey clean.

As the adults recklessly test the limits of the outdoors, Zach worries he might be in even more danger than he realized. Could the men around him prove more violent than the unforgiving weather, and the strange creature lurking in the dark? Zach will have to rely on his wits if he hopes to make it home safely. But he knows all too well that the wilderness can be unpredictable even at the best of times. And at the worst? Deadly.



Genre: Mystery

Praise for this book

"Tracy Sierra combines the forces of nature with the evil that men do to write an extraordinary double-whammy of a novel." - Linwood Barclay

"A chilling gothic thriller. Set in an eerie, icy landscape, Warning Signs proves that Tracy Sierra is a master of edge-of-your-seat suspense." - Flynn Berry

"The mountains have a way of showing our true nature. In Warning Signs, Tracy Sierra expertly exposes the layers of a relationship between a father and son. While leading a reader across the line between wonder and terror, she asks the most important question--what should we fear? Gripping, tense, and full of beauty, this novel will make your heart pound." - Claire Cameron

"Wow... What a novel! Warning Signs ticks every box for attention-commanding thriller: The plot is unstoppable, the characters rich and complex--with breathtaking psychological insights aplenty--and the author's voice is pitch perfect. And talk about a setting! Buy it, lock your doors and shut off your cell phone. Don't worry, you won't be incommunicado for very long. Bravo!" - Jeffery Deaver

"Warning Signs continues Tracy Sierra's trajectory as a rising star. A chilling story with emotional depth and an ending that will take your breath away. Fair warning to readers: once you start reading, you won't want to stop." - Alex Finlay

"An isolated setting and a pulse-pounding fight for survival combine to make Warning Signs a truly stunning novel." - Sian Gilbert

"As breathtaking as an avalanche, Tracy Sierra's Warning Signs is a perfect mix of inner torment, warped masculinity, evil suspense, and the sublime. It kept me up reading late into the night." - Sierra Greer

"Warning Signs is a truly unputdownable novel. Full of suspense and beautifully written, the book explores themes of wilderness, violence, and family ties with unusual subtlety. An enthralling book in every way." - Bruce Holsinger

"If you loved Nightwatching (didn't we all?) then you are in for a treat with [Warning Signs]. The tension the atmosphere, the dread, all there in spades. This is a book that sticks in your head long after the last page." - Lisa Jewell

"In Warning Signs, the raw force of nature and the darkness of humanity collide in a harrowing tale of a boy's struggle for survival. Sierra's sharp, evocative writing builds a tension so taut that it had me holding my breath. A brilliant follow-up to her incredible debut!" - Monika Kim

"Warning Signs is the best thriller I have read in a long, long time. It is atmospheric, full of heart and so nail-bitingly suspenseful that it had me at the edge of my seat from page one. I devoured it as fast as I could." - Hildur Knútsdóttir

"Fans of Tracy Sierra's riveting debut, Nightwatching, will be equally enthralled with Warning Signs, another expertly crafted, life-or-death thriller about fighting for survival, this time against mother nature and the sins of the father." - Vanessa Lillie

"Wow, Tracy Sierra has done it again -- knife-edge tension and a perfect denouement. Absolutely outstanding." - Andrea Mara

"A taut survival thriller with heart, Warning Signs is an incisive exploration of mother-son relationships, the examples we set for our sons, and greed--all wrapped up in a terrifying, high-altitude adventure novel. Sierra cranks the tension up, up, up before launching us into a pulse-pounding life-or-death chase. I inhaled this book in one sitting." - K T Nguyen

"Warning Signs is an atmospheric, pulse-pounding journey into the wilderness as well as into the human heart. The perfect, wintry thriller!" - Ana Reyes

"Oh my heart! Nobody does tension and terror like Tracy Sierra. A masterclass in group dynamics and atmospheric writing, with a young protagonist whose every step you will cheer in this fight for survival." - Holly Seddon

"Warning Signs is a riveting survival thriller about a boy fighting for his life on all fronts, set in the stark, dangerous wildness of the Colorado backcountry. Sierra's ability to seamlessly fuse a constant thrum of unseen, impending doom, with an aching tenderness that will break your heart is unparalleled. Sly, resplendent, and brilliantly fierce--what a gift it is to have Sierra's singular talent in the world." - Ashley Tate


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