Mack by Kim Fox

Mack Harris wants revenge. He wants to kill everyone responsible for the death of the young lion shifter who was under his protection and he’s willing to do whatever it takes to get his vengeance.
Kara Griffin has just escaped from a military facility that has been keeping her prisoner, but instead of fleeing as far away as she can get, she wants to return to save the rest of her family who are still trapped inside.
When the two unlikely pair connect, sparks fly and Mack will have to make an impossible choice between vengeance or his new love. But when old enemies come back to settle the score, there might not be a choice left to make.