Fleeing to Mexico, Kimble somehow contracts pnenmonia and seeks refuge at a local hospital where he is recognized by Dr. Howell, an ambitious American doctor whom is conducting reseach on menigitis. After Kimble recovers, Dr. Howell blackmails him into assisting with his research in exchange for protection from the local state police. While working with Howell's assistant, the attractive Reina Morales, Kimble soon discovers that several of the patients are being unwittingly infected and sacrificed for Howell's research purposes. Meanwhile, a persistent police sergeant, named Rodriguez, begins investigating Kimble's true idenity.