When Dr. Celeste Braun stumbles upon the body of a murdered undercover FBI agent while attending a medical conference in Puerto Rico, she is drawn into a sinister conspiracy that uses unwitting patients to carry information for a network of international criminals.

B.B. Jordan is the nom-de-plume of Frances Brodsky, Professor of Cell Biology and Director of the Division of Biosciences at University College London. She is a bench scientist recognized for her elucidation of basic cell functions that influence human metabolism and the immune system. Her writing is inspired by a love of science and a desire to communicate the scientific enterprise to the general public and humanize the process of scientific research. In addition to SECONDARY IMMUNIZATION, B.B. Jordan is the author of the two mysteries, PRINCIPAL INVESTIGATION and TRIPLET CODE, both featuring the brilliant virologist Dr. Celeste Braun.