A Thriller on the Swedish Railway

You may remember last year, I got my hands on  The Arctic Railway Assassin. It's part of the Adventures on a Train series, some crime fiction and adventure novel for children. Of course, I thought it would be for Wolfie, but it's really a book to be enjoyed together, father and son. It has a lot of things I love: a crime story, set in a train, during Christmastime and in a wintery landscape. What more can I ask for? We didn't have time to read it last Christmas, but we have started now. And there's another thing I discovered about it that makes me really like it: it's actually set in Sweden. What more can one want for a Christmas thriller?