The Woman by the Lake. Misted Pines Series, #3

Nadia Williams needs somewhere peaceful to sort through her grief after her mother is brutally murdered. She finds a cozy cabin at the side of a tranquil lake in the quaint town of Misted Pines in the Pacific Northwest. The minute she arrives, she knows it's perfect. The very night of her arrival, however, someone-or something-is scratching at her window. The next morning, she meets her one and only neighbor, Doc Riggs.
He's a rough, good-time guy who rubs Nadia wrong immediately. They clash, and neither of them are happy to be sharing their lake. But soon, Nadia learns the lore around her cabin, and how the townsfolk are certain it's haunted by the ghost of the man who was murdered there fifteen years before. Riggs and Nadia are suddenly thrown into a tangled web of history, betrayal, grief, secrets, with only one thing certain.
Someone-or something-wants them off that lake.