From international bestselling sensation Thomas Olde Heuvelt comes Echo, a thrilling descent into madness and obsession as one man confronts nature--and something even more ancient and evil answers back.

"A compulsive page turner mixing supernatural survival horror and pulp adventure" -- Paul Tremblay, author of A Head Full of Ghosts and The Pallbearers' Club

Nature is calling--but they shouldn't have answered.

Travel journalist and mountaineer Nick Grevers awakes from a coma to find that his climbing buddy, Augustin, is missing and presumed dead. Nick's own injuries are as extensive as they are horrifying. His face wrapped in bandages and unable to speak, Nick claims amnesia--but he remembers everything.

He remembers how he and Augustin were mysteriously drawn to the Maudit, a remote and scarcely documented peak in the Swiss Alps.

He remembers how the slopes of Maudit were eerily quiet, and how, when they entered its valley, they got the ominous sense that they were not alone.

He remembers: something was waiting for them...

But it isn't just the memory of the accident that haunts Nick. Something has awakened inside of him, something that endangers the lives of everyone around him...

It's one thing to lose your life. It's another to lose your soul.

Thomas Olde Heuvelt is the international bestselling author of HEX. The lauded novel was published in over twenty-five countries around the world and is currently in development for TV by Gary Dauberman and James Wan. Olde Heuvelt, whose last name in Dutch dialect means "Old Hill," was the first ever translated author to win a Hugo Award for his short fiction. He lives in The Netherlands and the south of France and is an avid mountaineer.

Paul Tremblay has won the Bram Stoker, British Fantasy, and Massachusetts Book awards and is the author of Survivor Song, The Cabin at the End of the World, Disappearance at Devil’s Rock, A Head Full of Ghosts, the crime novels The Little Sleep and No Sleep Till Wonderland, and the short story collection, Growing Things and Other Stories.

His essays and short fiction have appeared in the Los Angeles Times, New York Times, Entertainment Weekly online, and numerous year’s-best anthologies. He has a master’s degree in mathematics and lives outside Boston with his family.