The Defender: Ryder by Lisa B. Kamps

Ryder “Boomer” Hess: former Army Ranger. Demolitions expert. Problem solver…and the unluckiest bastard around when it comes to love. Meeting women is never a problem but actually surviving a relationship? Not happening. And all because of his kid sister’s best friend.

Hannah Montgomery: professional volunteer. Humanitarian activist. Eternal optimist…and a woman who lost her heart years ago to her best friend’s brother. She’s learned to turn that heartache into something constructive and now loses herself in helping others…until he shows up and turns her world upside down again.

When Ryder gets a call that his sister—and Hannah—could be in trouble, he drops everything and rushes to their rescue—and quickly learns that he might be the one who needs rescuing the most. But danger of another sort looms on the horizon and it’s up to Ryder to save them. And if he fails, he’ll lose a lot more than just his heart this time.