A Shot in the Dark - Henry Walsh Private Investigator Series, #9

Now that Henry's on his own, it's not just his PI business that's falling apart.After a trip to the West Coast of Florida to visit his parents, he's not exactly sure what he's supposed to do next. With his partner, Alex, now gone, he's feeling a bit lost. He's even considered walking away from Walsh Investigations for good. But everything changes when he receives a call from a woman who wants to find her father's killer.
The problem is, the murder took place over a decade earlier. The last thing Henry needs is a cold case nobody's been able to solve. But finding answers, when nobody else can, is the one thing that drives him. And he's somewhat intrigued when he learns the woman's never actually met the man she calls her father. He finally agrees to investigate, and his first step is to dig deep into the past. But it soon becomes clear someone's gone to great lengths to keep it there.
Just as he starts to get traction, his new client disappears. And Henry's the one left without answers. But his whole world comes crashing down when he faces a threat he never sees coming. With his own life in danger, it'll take more than smarts and investigative skills to save him.