Playing with Fire starts with an arson, two people died. It turns into a murder investigation when it is discovered that one of the victims was drugged with a date-rape drug. The other victim was unintended. Then there is another fire, also murder. There is also follow up with the boyfriend of the other victim, investigation into allegations of abuse, Peter Robinson does a good job of continuing the two story lines in a logical manner. The characters are not cookie cutter and are very believable. He must do an incredible amount of research. I also like that each novel in the series feels like a stand-alone. He does not do the same plot, same ending, different guest stars with each book in the series.