Lies Beneath The Surface

Also known as Deadly Suspicion, Killer in the Cabin, To Catch a Killer

Hanna notices some suspicious activity at a nearby cabin while she's kayaking by herself in a remote lake. Believing the woman and her daughter staying there might be in danger, she notifies the authorities. After the authorities find nothing wrong or unusual, they brush off Hanna. When she looks in on them, it sets off a deadly cat-and-mouse game of survival.