Books in the Heroes of Quantico series

For FBI Hostage Rescue Team member Evan Cooper, dignitary protection duty should have been a piece of cake. But Monica Callahan doesn't make it easy, refusing to be intimidated by a threat against her life until things escalate to a level that has Evan racing to save the stubborn woman who's swiftly stealing his heart.

When FBI Hostage Rescue Team member Mark Sanders is sent to St. Louis to work as a field agent, a chance encounter with his first love, Emily Lawson, is a welcome distraction. Until their reunion is cut short by a sniper's attempt on Emily's life that sets Mark on a mission to find the shooter before he strikes again.