Kate Jensen, a journalist, investigates the mysterious death of a karate master in a dojo in London. Soon after, another suspicious death occurs, making the case more serious and dangerous.
Her investigation leads her to Japan, where she discovers that the crimes are connected to a hidden secret and a tragic event from the past. As she digs deeper, she uncovers a story involving revenge, lies, and family secrets.
In the end, Kate realizes that the present crimes are strongly linked to an old unresolved incident, bringing the past and present together in a suspenseful investigation.