The opening scene is perfection. We meet the eponymous heroine of Diane Johnson’s latest novel, “Lorna Mott Comes Home,” as she rides in the back of a taxi, en route to the train station in Lyon.

The rules of shelving can seem arbitrary, even arcane, but the fundamentals are easy to learn: two hard covers, and no more than three paperbacks of the same title, on each shelf.  The exception is the face-out. If the jacket is displayed horizontally, behind it you can stack as many books as can fit.

Everything changes for 12-year-old Samantha McGinty in the summer of 1969. Her father, Brick, stops fussing over his Chevy each weekend, no longer spritzing the windows with water and vinegar and wiping them clean with old pages of the Erietown Times.