Well, maybe it is the bank fraud case with all its auxiliary subplots. In the midst of all the mayhem and murder, there are occasional glimpses of humor. Some of the cast of players are more caricatures than fully developed characters. There is, however, simply too much going on, too much jumping from one plot to another and one character to another, to make this a satisfying story. At the end, Susan gets yet another chip to add to her pile of stress.
Readers are likely to feel pretty stressed, too.