The Lake by R.J. Jensen

Paperback. Condition: Good. 1983. Tor.

The lake of placid water was framed in the forested hills of Arkansas. It was a beautiful place for a midnight swim.
Ilene dived forward and began to swim. Jerry's long body slipped beside her, his arms breaking the surface of the Moon-touched darkness.
Then Jerry disappeared, suddenly and silently. Ilene moved back, her eyes searching for Jerry. Where had he gone? Could he be diving into the dark depths?
Why didn't he surface?
In a sudden spasm of terror, she whirled and swam for shore.
She didn't make it.
Jerry was the first, and Ilene was the second.
How many more would there be before the lake's new owner discovered that there was something in the lake?
Something incredibly ancient.
Something ravenous.

Genre: Horror