When lab researchers and scientists are discovered murdered, Morgan Stark, brilliant doctor-turned FBI agent, is summoned to decode the medical clues. What is the connection between these people? And who is next?

Too Lost is book 4 in a new series by number one best-selling and critically acclaimed mystery and suspense author Rylie Dark, whose books have received over 2,000 five-star reviews and ratings. The series begins with Too Late (book 1), a free download.

Morgan Stark is a renowned surgeon, acclaimed by his colleagues for his brilliance as a diagnostician. But when his close friend and protégé resident is murdered, Morgan feels compelled to help the FBI decipher the trail of medical clues and bring the killer to justice.

FBI Special Agent Danielle Hernandez, 28, a rising star in the BAU, equally esteemed by her colleagues for her brilliance and determination, is not used to turning to a doctor for help in solving crimes. This unlikely partnership, though, may just surprise them both.

A cat-and-mouse thriller with harrowing twists and turns and filled with heart-pounding suspense, the Morgan Stark mystery series offers a fresh twist on the genre as it introduces two brilliant protagonists who will make you fall in love and keep you turning pages late into the night.

Book 5—Too Broken—is also available.