While hiking in the foothills of the Rocky Mountains, FBI Special Agent Kendra Dean and her K9 partner, Baxter, stumble upon a dead body stashed in the woods. The discovery changes both of their lives forever. Special Agent Rick Sanchez hunts a serial murderer who is targeting women on a multi-state killing spree. Kendra Dean, an agent Rick met on a joint mission six months ago, has found the most recent victim. Rick and Kendra once shared a tempting chemistry but time and miles made their spark a distant memory.

It should have been a routine investigation. Instead, DEA K-9 agent Adam "Deck" Decker watches in horror as one Denver hospital seems to be ground zero for overdoses of a new drug. Now Deck can only hope a certain ER doctor will help him and his canine partner track down the source. Dr. Tori Sampson has her reasons for not trusting federal agents, especially ones working for the DEA. But the rash of overdoses—including a heartbreaking case involving a teen—is alarmingly high. And the new opioid is not only extremely dangerous, it defies all the usual medical treatments. 

Officer Luz is lucky she still has a job after tasering a male colleague where it counts the most. Sure, he had it coming - which is why the police chief is giving Megan a second chance. The catch? Her new partner can't carry a gun, can't drive a cruiser, and can't recite the Miranda Rights. Because her new partner is a big furry police dog. So that's what the chief meant when he called Megan's partner a real bitch...With Brigit out on the beat, Megan is writing up enough tickets to wallpaper the whole station.

When a young girl is found dead in the mountains outside Timber Creek, lifelong resident Officer Mattie Cobb and her partner, K-9 police dog Robo, are assigned to the case that has rocked the small Colorado town. With the help of Cole Walker, a local veterinarian and single father, Mattie and Robo must track down the truth before it claims another victim. But the more Mattie investigates, the more she realizes how many secrets her town holds. And the key may be Cole's daughter, who knows more than she's saying.

In the wake of a devastating hurricane, Special Agent Meg Jennings and her Labrador, Hawk - invaluable members of the FBI’s Human Scent Evidence Team - have been deployed to Virginia Beach. They have their work cut out for them. Amid graveyards of debris, and the buried cries for help, the search and rescue operation begins. The most alarming discovery is yet to come - a teenage girl hiding in the Great Dismal Swamp. Shaken by the storm, she has reason to be scared. But this young survivor is terrified of so much more.