Beneath the Surface — Evelyn Vaughn

It hungered.
Deep in a Louisiana bayou lurked the heart of darkness - and Guy Poitiers' penance. A tragedy in his youth had torn him away from sweetheart Mary Deveraux and consumed his life with guilt. Now only Mary's white magic and a single gold coin offered clues to his salvation.

It waited.
Mary hadn't forgotten the cajun boy who'd been her best friend. And now the grown-up Guy was inspiring desires she knew he shared. But to settle the past, they would need to confront the very root of evil before it struck....

It struck.