The Troubled Man, by Henning Mankel

Troubled, and troubling. This is apparently the last Kurt Wallander novel. No, he doesn't get killed.

Wallander's daughter decides to have a child with a man named Hans. Wallander meets Hans's parents, and observes that his father is worried about something.

Soon, the father disappears, and the mystery begins.

This is not only a tale of police work in Sweden, but  one of international intrigue, and a query into what any of us can really know about any other, even those very close to us.