Katherine Humphries has a good life, a loving husband and a sweet daughter. Her past has long been forgotten and the shame of her greatest mistake suppressed. Until one day the past catches up with her and tragedy strikes again. Thrust against her will into the shady activities of the mysterious Agency, she discovers a secretive world of double-cross and espionage. Katherine finds herself with no option but to resurrect her old self and use all of her military training, to track down and confront a ghost from the past and face her own demons. Fuelled by her own desire for revenge, will Katherine survive the most dangerous mission of her life?