JACK
Lock the doors. Watch the roof.
For thirty years, Calder dismissed Jumping Jack as an urban legend-a masked figure glimpsed on rooftops, a warning whispered after dark.
Then building inspector Nora Keene finds evidence of someone moving through the forgotten spaces above the city.
When a routine inspection turns deadly, Nora discovers that locked doors offer little protection from a killer who knows the buildings better than the people inside them. He climbs where no one thinks to look. He enters where no one believes a person could fit. And three quiet knocks can be the only warning he gives.
As the body count rises, Nora joins forces with a woman who survived Jack decades earlier. Together, they uncover a history of hidden rooms, ignored warnings and a man who was never a ghost.
Now Jack knows Nora's name.
And he's coming down from the roof.
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