Pappi, lukkari, talonpoika, vakooja

Quite good, but not perfect. It took me a while to get really into the story. It was a slow start, but the ending was very good and worth it all.

(I'd seen the movie, which was great, but had forgotten just about everything except the main idea of the story, so the bad guy came as a surprise; however, I don't think I'd enjoyed the book less had I known who the mole was.)