Lone Wolf: Shifted book 10

Lone Wolf is book 10 in the Shifted series.
Matt Woodland has dreamed of being a pack enforcer for most of his life. When his brother Aiden asks Matt to join his pack as his Beta, it is more than he could have ever hoped for.
There€s only one problem.
Aiden already has one Beta, Brianna Robbins, and she and Matt don€t really get along.
The two Betas are forced to work together when King turns out to be more of a threat than they once thought. Can Matt put aside his animosity toward Brianna? He hopes so. Can Matt and Brianna work together without killing each other? He doubts it.