The Zoo Crew. A random assortment of individuals that came together in western Montana out of circumstance, stayed together by choice. Among them are Ajax, a gaming genius far from his native Boston. Kade, a forest firefighter that spends half his year roaming the blazing countryside, the other half perusing the local nightlife. Sage, registered nurse and proverbial mother hen for the group.

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.

Detective Reed Mattox, just three months removed from the death of his partner, has turned invisibility into an art form. Switching to the K-9, taking over the graveyard shift, moving to a farmhouse miles outside of Columbus - his every move has become predicated on putting as much distance between himself and the outside world as possible. That distance is shattered, though, when bodies begin turning up in The Bottoms, the poverty-stricken section of town he is assigned to patrol.

Three years ago, Ham retired to a quiet life in the remote desert of Northern Mexico. Realizing what she was doing would likely end in her death, she severed all ties, disappearing across international borders. Her retirement ended abruptly with a single message. The sole person in the world Ham feels the least bit of loyalty to is in trouble, in need not only of Ham but of the very skills that put her into hiding. Acting against every ingrained maxim, and ignoring the myriad warning signs popping up along the way, Ham returns north to find a great deal has changed in her time away.

Every town needs a hero, and Detective Cal Farrell fits the bill. He stopped an active shooter six months earlier, and now he’s become the darling of the Alexandria press. The problem is that Cal remembers nothing from that day. He’s working with a psychiatrist to recover his memories, but hasn’t had much luck. Then, on one of his morning runs, he is once again the first on scene for a grisly discovery—a body hanging impossibly high on a tree. Soon there’s another victim, killed by a blade and dumped in a ravine.

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.

Caitlyn Reed and her dog, Renegade, are thrown into the midst of murder and intrigue when they discover a dead body while on a trail ride in the black hills of Wyoming. The local sheriff is hell-bent on a conviction, and Caitlyn’s brother, Dylan, is in his crosshairs. Desperate to prove his innocence, Caitlyn turns to Deputy Colt Branson for help, but she must grapple with their rocky romantic past to gain his aid. As Caitlyn and Renegade pursue the killer, the investigation catapults their lives in a dangerous new direction.

US Marshal Arliss Cutter is a born tracker. Raised in the swamplands of Florida, he honed his skills in the military, fought in the Middle East, and worked three field positions for Marshal Services. When it comes to tracking someone down - or taking someone out - Cutter's the best. But his newest assignment is taking him out of his comfort zone to southeast Alaska. Cold, dark, uninhabited forests that are often shrouded in fog. And it's the kind of case that makes his blood run cold.

Matthew Riker keeps to himself, doesn't cause trouble, and never talks about his past. But after a chance encounter with a woman and a small child on the run, Riker will have to make a choice: use his hard-won skills to protect two innocent victims, or stay in the safety of his quiet life. What follows is an adrenaline-soaked thrill ride that will take Riker on a cross-country chase, through the seedy underbelly of a New York criminal empire, and into the darkest places of the human heart.

When you have to kill the same terrorist twice in one week there’s either something wrong with your world or something wrong with your skills - and there’s nothing wrong with Joe Ledger’s skills. And that’s both a good and a bad thing. It’s good because he’s a Baltimore detective who has just been secretly recruited by the government to lead a new task force created to deal with the problems that Homeland Security can’t handle....

Books one through three in the Cassie Quinn series, from Wall Street Journal and USA Today best-selling author L.T. Ryan.

Tracy Crosswhite has spent 20 years questioning the facts surrounding her sister Sarah’s disappearance and the murder trial that followed. She doesn’t believe that Edmund House - a convicted rapist and the man condemned for Sarah’s murder - is the guilty party. Motivated by the opportunity to obtain real justice, Tracy became a homicide detective with the Seattle PD and dedicated her life to tracking down killers.

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.

As the chief forensic anthropologist for the FBI’s Chicago field office, Christine Prusik has worked her fair share of bizarre cases. Yet this one trumps them all: a serial killer is strangling young women and dumping their bodies in the steep, forested ravines of southern Indiana. With each victim, the killer leaves a calling card: a stone figurine carved like the spirit stones found among the native tribes of Papua New Guinea—the same tribes Prusik worked with a decade earlier while doing field research.

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.