At a festival in Cornwall, in the hushed moments after the first eclipse Laura and Kit share, Laura interrupts a man and a woman. She knows she saw something terrible. But the man denies it. Later, in a panic, Laura tells a little white lie - which changes 4 lives irreparably. When the victim turns up on their doorstep, the truth seems to vanish ever further into shadow. As gratitude spills into dangerous obsession, Kit and Laura simply have to run. But they can't hide forever. With another eclipse on the horizon, the past is closing in on them again. Telling Kit the truth will cost Laura her marriage. But keeping the secret could cost them both their lives. And the person they fear the most knows exactly where they'll be.