in the world of espionage... the only way to survive, is to learn not to blink. for a brief time, they were the cia's secret weapon - wreaking unexplained havoc on the intelligence agencies of the world. then, in what proves to be their most intricate operation, whitney is killed. courtney stood helpless and watched as the white cargo van her twin sister was in, erupted into a fireball, large enough to do structural damage to the buildings around it. many are the hazards in the life of a spy, death being at the top of the list. since that day on crete, driven by an acute sense of destiny, courtney has gone on to become a wife, a mother, and... the cia's director of intelligence. today, however, courtney's life will undergo its second radical change. a secret delivered via her daughter, at a daycare center, four years after her sister's death, is about to become very public... by specific design. down the hall, in a different office, alice williamson - director, central intelligence - is about to use that very same 'secret' to pull courtney away from the safety of her desk, and back into the fray... back into the world of 'operations'. she accomplishes the feat, in matter of seconds, using only four words... "they have your sister." recalculation, the sequel to solution squared, is the next progression in the escapades of identical twin sisters whitney and courtney bergstrom - the would be 'girls next door turned spy', whose devious, deceptive, and slightly sinister behavior, lends credence to the concept that pretty girls with guns, should be presumed far more dangerous than they appear.