"A dead police officer... A department desperate for answers... Maddie Castle must take on the role that nearly took her life... She must once again become The Handler. Wounded in the line of duty, former K9 Handler Maddie Castle finds herself back to square one. The bullet that shredded her leg took the life of her four-legged partner. The pain of recovery goes well beyond the daily physical torment she endures. Time is the supposed healer of all wounds. In Castle's case, this hasn't proven true. In a hail of gunfire, she lost not only her dog, but the one thing she loved above all else...the job. Castle is back home in the trailer park she vowed never to return to. Taking a job as a private investigator has proven an unrewarding comparative to her former career. Barely making ends meet and hampered by the ever-present pain in her leg, Castle struggles to keep her footing in her new life. A K9 handler from Castle's old unit is gunned down. Castle is called in to assess whether the dog can be rehabilitated. The alternative is a consequence Castle can't live with. Working to save the K9 might just well save Castle from herself. As the hunt for the killer continues, Castle receives a call from a desperate mother searching for her missing son. The hunt for the boy leads Castle into the criminal underbelly of Pittsburgh. Powerful players who will stop at nothing stand in her way. Behind them lies the truth. Getting to it may cost her everything, including her life, as she seeks to expose a dark secret that could bring a city to its knees. Follow Maddie Castle as she walks the blurred line of right and wrong in a desperate search for justice" --