Sliver by Ira Levin

A young editor moves into a luxury Manhattan high-rise and becomes entangled with the building’s enigmatic owner, unaware he secretly monitors every apartment through hidden cameras. As her attraction to him grows, a series of suspicious “accidents” among residents raises her suspicions. A tense study of voyeurism and control, it tracks her mounting dread and the perilous discovery that the person she trusts may be orchestrating the danger surrounding her.

Purchase from Bookshop.org