The Intruder by Freida McFadden

When a hurricane batters Casey's remote cabin, she expects nature's fury—not a bloodstained girl at her kitchen window. The mysterious stranger refuses to speak, clutches a knife, and harbors secrets darker than the storm raging outside. As Casey uncovers disturbing truths in the dead of night, she realizes this girl will do anything to protect herself, and getting too close to the truth could be fatal. Trapped together as the storm intensifies, Casey must navigate a dangerous game of survival and deception. Is the girl a victim or a threat? With each revelation, the stakes climb higher and the night grows more treacherous. Freida McFadden masterfully weaves a tale of desperation where trust becomes a luxury neither can afford, and morning may never come. A gripping psychological thriller that explores how far someone will go when cornered by circumstance and secrets.