Summertime has arrived in Lake Tisdale. There are tourists everywhere, and on one particular day, the unexpected happens. As a dense mist surrounds the town, a man and a woman are found dead.

What first appears to be an accident soon turns into a murder investigation. An elderly man claims the mist murdered them, but Derrick Mallow and Greta McCall believe someone else is responsible.

Someone in a position of power knows what is going on in the small town, and seems to be going out of their way to keep the Lake Tisdale police department in the dark. Running out of time and clues, can Mallow and McCall close the case?