Enigmatic and extremely dangerous, CIA legends Francis and Caroll have been dubbed "The Sisters Death and Night" by their cohorts. But few know what these operatives do. They plot - and they have come up with the perfect crime. They've located the ideal pawn - known as the Potter, he is the exiled ex-head of the KGB sleeper school - and with artful deception the Sisters coerce him into betraying his last and best sleeper, the man he considers his son. Once awakened, this sleeper, an assassin living secretly in the United States, will launch a mission of death - unless the Potter, in a desperate race against time, can stop his protege from committing the Sisters' exquisitely planned, world-shattering crime.