Used book – Lake of Secrets, Kathleen O'Brien, Lucienne Boulanger-Beauquel

When the beautiful and wealthy Justine Millner disappears overnight, the wildest speculations run rampant in Firefly Glen, a small town nestled in the Adirondack Valley. But the mystery remains unsolved... until, two years later, her body is found on the shore of the lake next to her luxurious property, and Mike Frome, her ex-husband, is accused of the murder. An implausible hypothesis for Suzie Strickland, a rebellious artist secretly in love with Mike since high school, who only has bitter memories of Justine: she could never compete with the pretty, disdainful blonde whom Mike eventually married because she was expecting his child... Today, listening only to her instinct, and guided by the unspoken desire to see Mike again, Suzie decides to help the man she has never forgotten prove his innocence. She doesn't realize, however, that in doing so, she will open a terrifying Pandora's box...