In the deadly game of international espionage, elite anonymous operatives wage secret wars for power, information and national security. Agendas are rarely what they seem. Word has recently been circulating in these exclusive ranks of an ingenious new assassination device. Microscopic and injectable, it lies dormant inside its victim until activated and then kills in an instant, leaving no trace. In the frantic race to obtain this device, only two individuals, sworn enemies, have the skill, talent and tenacity to succeed. One is an agent known only by the code name Sever. Lethally trained to be the perfect weapon, Sever is precise and relentless in her pursuit of a goal. The other is the brilliant and determined former FBI man-hunter Jeremiah Ecks. Once preeminent in his field, Ecks resigned from the agency when his wife was killed in an explosion that left him a guilt-ridden emotional shell of himself. Now, forced back into service by his former mentor for the most challenging assignment of his career, Ecks prepares to face off against agent Sever, his most formidable foe.