Hidden enemies can be deadly. But the Brooklyn K-9 Unit is on the case.

On her way to question US Marshal Emmett Gage about a DNA match that implicates his relative in a cold case and a recent murder, Officer Belle Montera’s attacked. Now she and her K-9 partner must team up with Emmett to find his cousin and the person after Belle. But can they figure out who’s targeting her without becoming murder victims themselves?