In Boston, a disgraced medical student is sent to deliver a research paper that could save her career. . . . Four thousand miles away, in a jungle hospital in Cameroon, a brilliant, reclusive scientist, dying from an incurable disease that threatens to make each tortured breath his last, is on the verge of perfecting a serum that could save millions of lives, and bring others inestimable wealth. . . . In Chicago, a disillusioned private detective, on the way to his third career, is hired to determine the identify of a John Doe, killed on a Florida highway, with mysterious marks on his body.