Tess Gerritsen - The Sinner

Not even the icy temperatures of a typical New England winter can match the bone-chilling scene of carnage discovered at the chapel of Our Lady of Divine Light. Within the cloistered convent lie two nuns -- one dead, one critically injured -- victims of an unspeakably savage attacker. The brutal crime appears to be without motive, but medical examiner Maura Isles's autopsy of the dead woman yields a shocking surprise: twenty-year-old Sister Camille gave birth before she was murdered. Then another body is found mutilated beyond recognition. Together, Isles and homicide detective Jane Rizzoli uncover an ancient horror that connects these terrible slaughters. As long-buried secrets come to light, Maura Isles finds herself drawn inexorably toward the heart of an investigation that strikes close to home -- and toward a dawning revelation about the killer's identity too shattering to consider.

Comment: I'm enjoying this author's books more and more. The author clearly intended to write deep thrillers, where there's lot of suspense and we don't know exactly what makes the killers do what they do. In this case, I think she was very smart in creating all the clues the detectives are discovering, in order to make us think something and in the end...I was surprised until the very end. I had an idea and it was close to it, but I didn't really see what was the killer's real motivation to commit those crimes. So, I guess the thriller part was again, well done, because it makes us think about everything going on.
Some people I talked to have said the details are too specified and someone without medical background has more difficulty to understand some technical things. Well, yes some things need to be read with more attention, but I didn't find them too harsh, I've read many medical thillers and although I don't really know how the procedure is or why it's done like that, it doesn't put me off, so I don't see why it's such a discussed topic.
I also like the books because the author puts in a certain dose of romance, not much, and most of it is implyied, but nevertheless, it's enough to entice. In this third book we see an evolution of one of the character's personal life from the last book and in th end we can't help smiling because of it. There's also more information about another protagonist and we get to see some tidbits of her childhood and ended marriage. I guess the author is giving small doses of their personal dilemmas to increase this sense of dicovery, to make us curious but not dumping everthing at once and thus, making us want to read more.
I, personally, am convinced to keep going.