Dead White (Tor, Nov 1983) by Alan Ryan. A detailed moment here or there in the narrative made me think this book was Stephen King-lite, but even that is inaccurate as King's style is famously colorful, homespun, and even vulgar; Ryan can barely be said to have a style at all. Which isn't necessarily a criticism, for the story itself, as well as the suspense generated by short, time-stamped chapters, is just enough to keep a casual reader's interest.
At the Mountains of Madness or The Thing, The Terror, The Dead Zone, or The Search for Joseph Tully, then think of Body Heat or the greenhouse opening scene in The Big Sleep, or the entire sub-sub crime genre of "Florida noir" and writers like Elmore Leonard, Charles Willeford, James W. Hall, and Carl Hiaasen. But I digress.
Dead White does what it does just well enough so it doesn't seem a waste of time. If that sounds like a recommendation, it is; if not, that's cool too.