Fearless Bonds by Sheri Eleese

Trying to thwart the bad guys can be hazardous to your health…unless Fate sends someone to the rescue.
It should have been a straightforward assignment; run surveillance, go undercover to deliver the antidote, identify the traitors, and shut the operation down.
When Bill snuck in after-hours for a quick look around, he didn’t expect to stumble across a robbery in progress. Or that his mate would be the thief.
It’s going to take all of Bill’s expertise to keep Connor safe when the bad guy comes looking for revenge. But when Bill gets into more trouble than he can handle, who’s going to be the one to rescue him?

*This book follows the timeline of the series and is best read in order; however, sufficient details have been added for it to be enjoyed on its own.