Number 14 in the ongoing Dave Slater mystery series by P. F. Ford is The Invisible Man. Our two heroes, former police detectives Dave Slater and Norman Norman of Tinton, England, are contemplating the collapse of their private detective enterprise. Lack of clients is the problem. Then, just as they’re preparing to shut down, a woman comes to see them. Lizzie Becker says that her 14-year-old daughter Lily died in a car crash two years before. The police say the girl had stolen the car, but Lizzie won’t believe it. In any case, she has just received a text message from her daughter’s phone. The phone has not been seen since the accident. She knows her daughter is dead. But what kind of monster would send her a message like that, to open old wounds?

Dave and Norman take the case. An examination of the accident site leads them to a strange homeless man, one who claims to be a war veteran with PTSD, who claims to have seen the aftermath of the accident. Interrogation of the girl’s other family members, and of the family that owned the stolen car, leads them to questions of business fraud, adulteries, and possible child abuse. There are dark secrets here, and deep hatreds, and a ruthless plan for vengeance.

As I’ve said before, I don’t rate the Dave Slater series extremely high as detective literature. The prose is less than masterful, and the plotting (I think) somewhat weak. I like the characters of Dave and Norman (that’s the main reason I keep coming back), but they seem to spend an awful lot of time just chatting back and forth. And the ending of this story was… kind of a letdown.

But it’s another book in a pleasant series, and it was enjoyable. Minor cautions for fairly mild rough language and disturbing themes.