Dive into the world of Maddie Castle, a retired K9 handler turned private investigator, in this heart-pounding collection of the first three novels in the bestselling series. From gripping mysteries to life-threatening pursuits, Maddie and her canine partners battle danger, corruption, and their own pasts to bring justice to those who need it most.

Some horse stables are remote for a reason… Private investigator Nikki Drake thought she was following her vet’s orders by taking her K9 partner to an isolated log cabin deep in the wilds of California. But Gunner doesn’t understand he’s in rehab and his remarkable nose leads to a gruesome discovery. When both the local police and a powerful stable owner brush off her find, she does some digging of her own. Soon she is on the run, with both a terrified groom and a pricey racehorse in tow. The more she learns about the sinister owner, the faster she realizes there is more at stake ...

It’s tough working nights with the NYPD. The crime rate is high, the hours are terrible, and forget about a personal life. So, when Officer O’Reilly and her K-9 Rolf switch over to the day shift, things look up. She’s even able to find time for a new boyfriend. But when the theft of a priceless painting from the Queens Museum leaves a fellow police officer dead, Erin and her four-legged partner find themselves dealing with dangerous criminals, sleazy art dealers, and obstructive detectives in a race to capture the killers...and just maybe bring closure to a 75-year-old crime.

DEA Agent Doug Bridges is angry to realize his stepsister has been kidnapped after her night shift at the hospital. He goes into full agent mode to investigate, but soon runs into dead ends. Winter in northern Wyoming is no joke and he needs help, fast. When he’s referred to the Sullivan K-9 Search and Rescue team, he convinces Maya Sullivan and her Siberian Husky Zion to help him find Emily.

After a betrayal that almost took his life, Detective Joel Standage is deskbound. A new assignment is his chance to find out if he still has what it takes to be a cop. His mission? Get close to Mollie Crane, a woman who’s as guarded—and wounded—as he is. Her service dog, Magnus, trusts Joel before she does. When it becomes clear that his interest in her crime boss ex-husband is putting her in danger, what started as a case becomes personal, and Joel will do whatever it takes to protect her…

Eden Mercer, a determined young officer in the fog-shrouded, tight-knit town of Nightfall, Oregon, is haunted by her past in a fundamentalist cult. With her loyal K-9 partner, Shadow, by her side, she’s eager to prove herself in a department dominated by machismo. When a couple stumbles upon a woman’s body in a ritualistic burial deep within the dense, misty forests, Eden is thrust into a chilling mystery. As she delves deeper, disturbing clues and unsettling secrets tied to a local cult emerge.

K-9 officer Jackson Locke’s sister has vanished—and the key to finding her lies with Amy Scout…his sister’s best friend and his old crush. But when Amy comes under attack, two things become clear: Jackson’s sister has been investigating cold cases and someone wants Amy dead. Now he must untangle the mystery between the cold cases and his sister’s disappearance while guarding Amy from an enemy willing to kill to hide the truth…

K-9 officer Jared Miles stumbles upon a crime scene on his day off and believes Kassie Ashbaugh is the victim of a random attack. However, as threats on her life continue, he realizes that Kassie is in grave danger. Her father's abandoned boat suggests foul play, and Jared suspects someone is after Kassie for something her missing father is hiding. Can Jared unravel the mystery before unknown enemies catch her?

Former Special Forces operator Sergeant Crew Gatlin takes everything in stride, even the career-ending incident that separated him from the army, half a leg, and his beloved working dog, Havoc K027. Putting his life back together and lying low, he takes a job with A Breed Apart and is unexpectedly reunited with Havoc. It’s too good to be true—and the proof is in their first assignment: to work as a K-9 team for a television drama in Los Angeles.

Meg and Hawk are part of the FBI's elite K-9 unit. Hawk can sniff out bodies anywhere - living or dead - whether it's tracking a criminal or finding a missing person. When a bomb rips apart a government building on the National Mall in Washington, D.C., it takes all of the team's extensive search-and-rescue training to locate and save the workers and visitors buried beneath the rubble.

After their last deployment, when she got shot, her fiancé, Martinez, got killed, and his bomb-sniffing dog, Elvis, got depressed, soldier Mercy Carr and Elvis were both sent home, her late lover’s last words ringing in her ears: “Take care of my partner.” On the Fourth of July weekend, when all of Northshire celebrates with fun and frolic and fireworks, the dog alerts to explosives and they find a squalling baby abandoned near a shallow grave filled with what appear to be human bones.

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.

Loner Boone Hendrix left the military with ghosts that haunt him. He lives with his dog Atlas on a farm in Vermont. Alone. Just the way he likes it. Until he rescues a half-drowned, beautiful brunette from his river. Gemma Newhouse is the daughter of the richest man in America, and from the abrasions on her wrists and her drugged state, she’s on the run from someone dangerous. She’s nothing like Boone expected—sweet, smart, and likes baking—and she ignites a fierce need inside him.

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.

This collection includes Chasing Justice, Hunting the Truth, and Killer Secrets.