John Medina series

Targeted for murder after she takes custody of a mysterious notebook, Karen Whitlaw is protected by detective Marc Chastain, with whom she begins a passionate relationship while they seek to uncover the mystery behind the notebook's past.

CIA agent Lucas Swain is ordered to either kill or capture contract assassin Lily Mansfield after she goes against agency policy to avenge the murders of close friends, but Swain and Mansfield soon find themselves working as a team to find out why her friends were killed and to stop a plot that could devastate the world.