In the run-up to Christmas, Swedes opening their mailboxes in hopes of greeting cards instead got a chilling reminder of the troubled times they live in. A 32-page brochure mailed by the authorities to the country’s 5m households urged citizens to consider how they would behave should Sweden come under attack. “In Case of Crisis or War” is full of practical advice, should an unspecified foe stage an invasion: how to stem severe bleeding (apply firm pressure on the wound), where to find reliable information (tune in to public radio rather than social media) and useful tips on nuclear fallout (radiation levels will fall drastically after a couple of days, apparently). Illustrations of forlorn-looking Swedes sitting in civil-defence shelters ram home the point that war is not something that happens only to other people. It could be you, one day. So what are you going to do about it?