This is classic Weir, with the addition of a women's-fic-style subplot about the hero's sister, Molly, who becomes the heroine of the companion book, ONE FINE DAY.
This is a pretty gripping read in a way that ONE FINE DAY isn't. I don't know if it's because this one's a romance (as opposed to the women's fic vibe of ONE FINE DAY) or if it's because the hook is so good, but I found it hard to put down. The set up is this: at the beginning of the book, the hero is virtually a vegetable. He sustained a major head injury in a car accident, he's being heavily sedated because he acts violently when he's coherent enough to move or think, and he lost all memory of everything that's happened to him since Vietnam. In his own head, he's approximately 19 years old. The heroine is his deeply troubled psychiatrist. As they fall in love, he gets better. She gets worse. They take turns rescuing each other.
Weir mentioned online recently that she now finds this setup -- the mentally young hero in a 38-year-old's body, falling for his doctor -- troubling and kind of squicky. I was prepared for that, but in fact it didn't bother me. Sammy's mental age never felt like an issue, and I started wondering, is memory all that makes us mature? If we lose the part of our brain that holds our memory, that doesn't make us young. It only makes us different. I liked that aspect of the plot, the way Sammy had to grapple to come to terms with who he was and who he would be going forward. There's no pretense that he's going to get his memories back. His arc is all about figuring out how to live without them.
Anyway, there were a few things I didn't like here, and Rachel isn't as sympathetic a heroine as she might be (we see her grieving her daughter but never see her thinking about her daughter -- I think we needed more insight into her as a character, separate from her feelings for Sammy and from her pain), but overall I liked the book a lot and found it hard to stop reading. Always a good sign.