Title: Oaths and miracles
Description: From back cover:

Two people, the widow of a murdered scientist and an unstable, hard-boiled FBI agent, join forces to follow a trail of science and death.  It leads them through a biotech company in New Jersey to the mafia, to a paramilitary splinter group, to a religious commune in upstate New York, and finally to a deadly secret that may be killing someone right now.
Subjects: Recombinant DNA, Detective and mystery stories, Fiction, Fiction, science fiction, general