From America's coastlines to exotic beaches around the world, shark attacks are becoming more unpredictable. Many of these attacks occur suddenly, in large numbers and in unexpected locations — puzzling locals and scientists alike. Experts investigate these mysterious incidents to discover what is affecting some of nature’s most feared fish.

Laney is dreading her high school reunion because of a sad background. However, when classmates begin to die, she must find the perpetrator before she or her daughter become the next victim.