“Passing Strange” by Ellen Klages is a lightly fantastic tale of life in San Francisco’s lesbian culture in the 1940s. A wistful romance, in part. A mystery as well. Framed by modern bookends steeped in the culture of geeky collectables. It’s a quick and engrossing read and is an excellent example of how the same world-building techniques essential to SFF are put to good use in period settings.