The addictive million-selling mystery taking Japan by storm, from the author of The Times Bestseller Strange Pictures

A twisty puzzle in which the reader is the detective, examining a series of creepy floorplans for clues:

A sinister hidden room.

A dead space between two walls.

A sealed cellar.

A child's face glimpsed at a window.

Every house hides secrets.

But some secrets are far darker than others.

More than a million readers have discovered the terrible truth behind these strange houses.

Now it's your turn.