Reeling from her brother's death, Claire Brooks has vowed revenge on the member of The Company who she believes to be responsible: Stanton Howard. Claire follows him to London where she is captured by the Wardens of the Realm and placed in the custody of Alistair Payne. Seeing the prospect of revenge slipping away, Claire convinces Alistair that she has defected. The two pretend to be engaged as they trail the covert operation. However Claire cannot deny the growing attraction she feels for Alistair, causing her a painful choice when Howard finally comes within her reach.