No surprise here – Lynn Blackburn keeps you on the edge of your seat in this page-turner novel! Unknown Threat is the first book in her new series Defend & Protect. The storyline is gripping and keeps you on your toes wondering who the killer is and if they will strike again. FBI Special Agent Faith Malone is intelligent, confident and determined to succeed. Secret Service Special Agent Luke Powell is fiercely loyal and fighting to stay alive. Together they will have to join forces to find the killer and fast! The energy and tension between the pair has you rooting for them from the start. The secondary characters are just as engaging as the main characters. Faith’s sister, Hope being my favorite! It would be amazing to see more of her in future books. If you are a fan of Dee Henderson or Ronie Kendig, you will not want to miss Unknown Threat!