The House Across the Lake by Riley Sager

The novel centers on Casey Fletcher, a recently widowed actress who retreats to a lakeside home to escape her turbulent past. From her vantage point across the lake, she becomes intrigued by the seemingly perfect lives of her new neighbors, the Hamiltons. However, her fascination turns into obsession as she begins to suspect that something sinister is happening behind the façade of their idyllic life. When one of the Hamiltons goes missing, Casey’s own troubled past comes into play as she is drawn into a dangerous investigation. The story weaves a tense narrative of deception, hidden truths, and psychological intrigue.