On a foggy, early summer morning in Boston, Claire Rollins goes for a run along the Charles River. When a woman runner passes her in the mist, a terrible sense of alarm rushes through Claire's body leaving her feeling anxious and uneasy. The next time she sees the young woman, Claire is thrown headlong into a confusing mystery of murder and deception. Can Claire, with the help of her friends and her "intuition," get to the bottom of the crime before another person loses her life?