I cannot agree with the notion that Guy LeMerle is in any way appealing, and I cannot understand why Juliette is so drawn to him...
The allure of a "bad boy" seems to be fairly widespread. So many authors go for the "misunderstood cad with a heart of gold", but that is most assuredly not the case here. There is absolutely nothing about Guy LeMerle that would make one say "but, at heart, he's a nice guy". He is manipulative, mendacious, selfish, incapable of remorse, and, to a great extent, unfeeling.
Why, then, does Joanne Harris want the reader to like him?
Seventeenth-century France...people are fearful of witchcraft, the Plague, gypsies, you name it. In July of 1610, we find ourselves in a remote abbey where discipline is lax and a motley crew of nuns exists on the fringe of mainstream religious society. It is there that we meet Juliette...formerly known as L'Ailée, a dancer and acrobat who has taken refuge there after escaping (with the help of none other than Giordano Bruno) imprisonment on a charge of witchcraft five years earlier in Épinal.
Suspended disbelief was suspended as soon as Giordano Bruno stepped on the stage in more or less 1605...he'd been dead for 5 years by then (to be specific, in February of 1600 in Campo di Fiore in Italy).
Juliette arrives at the abbey, gives birth to her daughter Fleur, and becomes a part of the community of nuns with checkered pasts. It is there where she suddenly starts seeing portents of all sorts while watching the performance of a group of saltimbanques and, because "omens!", the old Abbess dies and is soon replaced with a child abbess who brings her own confessor in tow.
Yes, the confessor is none other than Guy LeMerle passing himself off as a pious priest. Of course, they immediately recognize each other. LeMerle sends Fleur away with promises to let Juliette have her back. Long story short: the guy is a liar and a manipulator. He cares nothing for the naiveté of the women who surround him; he uses all of them as pawns.
The narrative structure is not very helpful. The novel is composed of "journal entries" that follow dates from July 3rd to August 15th of 1610 and bounce back from Juliette's version to LeMerle's version. It's unclear at times which is which, and one starts to wonder why anyone would bother using the dates at all.
The story takes place in 1610, and we're still expected to believe that the whole story takes place in 43 days. We are also given the bit of information that the tide takes 11 hours to turn in Noirs Moustiers, where the story takes place. Technically, travel time between the "island" and the "mainland" is cut by half under those circumstances, but...somehow...a new statue of the Virgin is procured and installed promptly to replace the pagan one they had before, construction materials and workers are easily transported, and correspondence with the bishop is so prompt that he is expected to be present for the Feast of the Virgin Mary...
I had to stop reading from time to time to ask myself if perhaps, there was some sort of messenger pigeon system at work here, or if some 17th-century version of French Home Depot was super efficient and timely with deliveries. Considering how quickly they found workers to do expensive repairs with such a time crunch, I'd love to find some Breton contractors to work on our home projects.
Suspended "suspended disbelief" aside, this novel is about a man who exploits women's weaknesses with zero consideration for their feelings or the consequences they might face in light of his actions. That he is portrayed as charming and keeps saying "trust me", and then Juliette rescues him from certain death and then is excited to see he has come looking for her again...it's just sad, isn't it?
LeMerle is tried for his crimes, but Juliette helps him escape. Sure, the nuns give him a beating, but who cares? The reasoning behind his behavior, his plan, his scheme, and his lies is really just "meh!" How stupid and childish is this guy that he's willing to have the child abbess set herself on fire, along with the rest of the abbey, just to take revenge on his father, the bishop?
Honestly, this book felt like someone biting more than they could chew, and wanting to have their cake and eat it too. "Oh, I've created this really bad, bad boy, but you'll love him anyway." I personally didn't love him, like him, or would have forgiven him. Juliette is presented to us as an intelligent woman who has some learning under her belt, but in the end, she's just another gullible woman willing to forgive an abusive ex-partner because he is capable of "grand gestures."