When a teenage joyrider crashes a stolen car and ends up in a coma, a routine DNA test reveals a connection to an unsolved murder from 22 years before. Finding the answer to the cold case should be straightforward. But it's as twisted as the DNA helix itself. Meanwhile, Karen Pirie finds herself irresistibly drawn to another mystery that has its roots in a terrorist bombing two decades ago ... Her most gripping, chilling, suspenseful novel yet.