Saving Amanda (en Inglés) - Elle James

For Ex-Navy SEAL, Carter Manning, nothing worthwhile is easy. Having lost the people he loved, he dedicates his life to the hard stuff to keep from looking back. The future is strictly about the next mission, not settling down or raising a family. 

When a rash of suicides plagues the Wind River Reservation in Wyoming, teen counselor Amanda Small calls on the Brotherhood Protectors to help investigate what she suspects are murders. 

Manning and Small team up to investigate, discovering an attraction neither expected nor wanted. As they close in on the truth, they become targets and must decide whether their love and their lives are more important than stopping the next "suicide."