'A pure action horror movie set-up, a life-or-death moral dilemma and a terrific, devious twist... I could hardly look away' GILLY MACMILLAN, AUTHOR OF THE BURNING LIBRARY

One week to escape

High in the mountains, a sudden rockslide traps ten hikers in an abandoned bunker, nicknamed 'The Ark'. Then it starts to flood.

One person will be sacrificed

There is only one chance of survival - in order for the rest of them to escape, someone must be left behind.

But one of them has other plans

As they struggle to decide who to abandon, the group is torn apart by a brutal murder. And it won't be the last.

Can they unmask the murderer and reach safety before the water rises? Or will The Ark become their tomb?



Haruo Yuki is a mystery and science fiction writer based in Japan. He is the author of three standalone novels and several continuing mystery stories currently serialized in Japan. His true identity remains a mystery.



A pure action horror movie set-up, a life-or-death moral dilemma and a terrific, devious twist... I could hardly look away



Has the perfect mix of locked-room tension and survival-thriller chaos. A killer on the loose, water pouring in, and a group forced to pick who lives and who dies? Exactly the kind of book you tear through in one sitting



Magnificent... A riveting locked‐room mystery



A clever locked room mystery from Japan with an added touch of horror... A relentless race against the clock... Fast-paced and rewarding, the novel's ingenious blend of genres and tropes generate a strong sense of foreboding and the final, mischievous twist does come as a major surprise and caps a rewarding read