Scientists James Logan and his wife, Linda, have their dream careers at the world’s leading biotech company, GeneFirm, Inc. But their happiness is interrupted by a devastating bioterrorist attack: a deadly superflu that quickly becomes a global pandemic. The GeneFirm complex goes into lockdown and Linda’s research team is sent to high-security underground labs to develop a vaccine.

Above ground, James learns that GeneFirm security has been breached and Linda is in danger. To save her he must confront a desperate terrorist, armed government agents, and an invisible killer: Virus Thirteen.