Crack CIA analyst Trista Gold is a whiz with the computer, but not so much with people. She hides behind her job, analyzing top-secret code and making recommendations on national security. CIA K-9 officer Sgt. Matt Connors suspects that beneath Trista's uptight appearance, there's a sexy woman itching to cut loose. But he doesn't dare act on his attraction. He's a loner and always will be. Keeping away from Trista is a must-do directive. Until he doesn't have a choice. During a routine assignment, Trista stumbles across a cryptic exchange. Then someone tries to murder her - twice.

Massachusetts State Police Sgt. Nick Houston is as tough as they come, and he and his K-9, Saxon, are hot on the trail of a major illegal-gun dealer. But his best lead - the beautiful owner of the Dog Park Cafe, Andi Hardt - is not cooperating. Doesn't matter how sexy she is or that his dog seems to be in love with her. She's a suspect, and he won't cross that line. Ever.   

ATF Special Agent Eric Miller and his explosives detecting K-9, Tiger, pull over a truck, the contents of which are explosive. Literally. More shocking, the driver is the kid brother of a woman he left behind. One who still haunts his days and his nights. They'd never so much as kissed, but Tess McTavish never forgot the handsome, dangerous agent who vanished in a shroud of mystery. Now the last thing she needs is an ATF agent with his own agenda. Doesn't matter that Tess and her brother are innocent. If Eric learns the truth of their past, they'll never be free.

For wealthy socialite Katrina Vandenburg, business meetings and charity galas are all part of her orderly, structured world - one that gets blown to hell after finding two dead bodies in the same day. The police think she was in the wrong place at the wrong time. FBI Special Agent Dayne Andrews thinks otherwise. Dayne and his K-9, Remy, are tracking a cold-blooded killer, and that trail...leads straight to Kat. 

Ambushed and left for dead, US Secret Service K-9 Officer Markus York is on the mend and laying low in a safe house while his team tracks down his attacker. Even with his K-9, Ghost, for company, he gets restless and decides now is the perfect time to do some repairs around the house...and inadvertently tears open his wounds. 

Two years after his brother's murder in jail, Department of Homeland Security K-9 Officer Kade Sampson is still haunted by guilt. No man should ever have to arrest his own brother, even if he is laundering money for a drug cartel. Fortunately, Laia Velez—his brother's gorgeous widow—never learned the truth about Kade's involvement. But when she asks him for help, he knows that trouble with the cartel is far from over . . .

Getting locked up had been easy. But for K-9 Sergeant Jamie Pataglio, going undercover at a maximum-security prison—and infiltrating the Mancusco crime family—was the hard part. Now, six months later, Jamie's been accepted as one of the mob's own, and he's walking out of the gates as a free man . . . and stepping into the criminal underworld. There's only one small, gorgeous problem: Bella Bianco.