Healy writes a good, solid mystery. The plot clicks along, Cuddy as PI is believable and fully dimensional, the New England atmosphere is vividly painted. Ditto with other characters. And he is quite good at coming up with an unexpected plot twist.
Only one thing bothers me. As part of his back story, Cuddy's wife Beth died of cancer. As the series progressed, his visits to her grave evolved into a two-way conversation, which I find ridiculous. Healy once described seeing a man talking to a headstone, which inspired the element. So I get the idea, just not the execution.