Two mysterious deaths—one in LA, one in Boston. Same horrific symptoms. No known cause.

ONLY WRONG ONCE is the first book in the pulse-pounding FBI & CDC Thriller series from USA Today bestselling author Jenifer Ruff, and a remarkable look at the efforts and sacrifices of those who protect us.

"STUNNING, TERRIFYING, AND UNFORGETTABLE."- Author, D. Carrigan

"RIVETING AND ALL TOO REAL!" – Author, J. White

"A BRILLIANT BOOK!" - U.K. Review

"ABSOLUTELY POSITIVELY FABULOUS!"- Amazon Review

When FBI counterterrorism agent Quinn Traynor discovers the first victim of a lethal, unfamiliar virus, he calls CDC epidemiologist Madeline Hamilton. Their investigation reveals an imminent bio-terror attack, and their only hope is to identify the terrorists carrying the disease before it spreads. Every moment counts in their race to prevent a pandemic. But the ensuing nightmare hits closer to home than they ever anticipated, and one of them will pay an unimaginable price for protecting the country.

"And let's remember that those charged with protecting us from attack have to be right 100 percent of the time. To inflict devastation on a massive scale, the terrorists only have to succeed once. And we know that they are trying every day." - Former National Security Adviser Condoleezza Rice

"Jenifer Ruff does an outstanding job of weaving personal stories amidst the action. This book will keep you glued to the pages from beginning to end, wondering what will happen next."- Author, S.Wilson

"The story is riveting, the characters are well-drawn, and the plot moves at breakneck speed. Be prepared to be mesmerized. You won't put the book down until you get to the end." - Author, R. Pendry