This is the first book of Johan Theorin I read and I must say that the story is well put together and very rewarding if one is interested in history. Where I block a bit is on the label "polar" which left me pensive and personally I see more a saga where family secrets and injustices resulting call for vengeance. The 4th cover neatly sums up this novel and the various protagonists are well drawn. The amateur detective is a grandpa full of resources which, if it is physically diminished, was sharp. In short, if you love sagas, go for it!