I was riding the F train home the other day reading Colson Whitehead’s The Underground Railroad. The local went express at Jay Street in Brooklyn, and I exchanged an exasperated smile with a woman on the platform. “Is that good?” she asked, pointing to the book. “I’ve been meaning to read it.” I called Whitehead’s disturbing way of mixing history and invention in his novel about slavery, “steampunk abolitionist” and she liked that. Manners obliging, I asked what she was reading. “Something with Ove in the title.” It was funny in surprising ways, but she couldn’t remember the name. We agreed nothing induces amnesia like being asked what you’re reading. The name and author came to her on the local. A Man Called Ove by Frederik Bachman. I promised to look it up. I got off at the next stop feeling rich for our impromptu book club, and grateful for a moment of literary communion that’s all but disappeared.