Jacob Underwood is a contract employee of the Special Services Section, a shadow department in the faceless multinational corporation DBG. Jacob is not a businessman...he is a hired assassin...and his job is to neutralize problems deemed unacceptable by the corporation. Jacob is not like other employees, nor is he like other people. Suffering from Cotard's syndrome - a real condition that causes people to believe they are dead - Jacob perceives himself as nothing but a Shell with no emotion and no sense of right or wrong. Emily Buchanan is a bright young second-year associate for DBG, and she has disappeared without a trace. Suspecting she may have stolen valuable information and a fortune from the company, Miss Holquist - Jacob's handler at DBG - assigns him the task of tracking her down and neutralizing her. Jacob's condition allows him to carry out assignments with ruthless, logical precision - devoid of guilt, fear, or dishonor. But as his new assignment draws him inside a labyrinthine network of dark dealings, Jacob finds himself up against something he is completely incapable of understanding. Spark is an ingenious and chilling vision of modern-day humanity under constant, invasive surveillance and a pulse-pounding game of cat and mouse.