The Red Lotus

Chris Bohjalian's books are usually pretty good, and I liked this one. It was a bit creepy, being about a possible pandemic, since it was published before COVID-19. I also learned way, way more about rats than I ever wanted to.
Alexis and her boyfriend, Austin, are on a bicycling trip in Vietnam when Austin disappears. His broken, battered body is discovered a day or two later, a victim of a hit and run.
Very tragic. Case closed.
No, of course not. Alexis, who is an ER doctor, noticed a weird puncture wound on Austin's hand, even though the bicycle gloves he was wearing had no corresponding holes or tears. So the wound occurred *before* the accident that killed him. Throw in the fact that Austin lied about his father and uncle's involvement in the Vietnam war, and everything starts to look a little bit suspicious. It was definitely a page turner.