As a child, Sara was a member of a project known as HAMELIN, her employers forcing her to commit espionage on their behalf. Having escaped their clutches in India, she's made it to the seaside paradise of Acapulco, where she thinks she's safe. When she's approached by a man who asks her to use her skills in locating his daughter, however, Sara finds herself pulled back into the life of a spy.

Travelling from fast-paced Mexico City to the jungles of Guatemala and the shadowy island of Cuba, she uncovers more than she bargains for, about the true reason for the girl's disappearance, and her own childhood. All the while, she is being hunted by a fellow operative who will stop at nothing to fulfil his mission …