An everyday apartment open house becomes the stage for Fredrik Backman’s latest novel, when a bank robber bursts in and takes a group of strangers hostage. As the title hints, each member of the group bares his or her own anxieties, not just about the hostage situation, but about their individual lives. Backman is a funny, charming story teller, and Anxious People is a fine showcase for his talents as a writer. There are twists and surprises. There are editorial asides. Beneath it all, there is a deep sense of warmth and empathy.