All the best stories are suspiciously hard to source; the woman who fell down a hole that opened up in the sidewalk and then immediately resealed, the car that drove into a storm drain and disappeared, leaving tire tracks that abruptly ended in the tunnel silt, the man who teleported across the equator, while others are well-known hoaxes like the disappearance of Oliver Lerch. but that's par for the course with Steiger and it's a fun fast read full of weird speculations and entertaining tall tales
If you, like myself, love to read a bunch of wacko stories in a row separated by paragraphs of completely bonkers conjecture, I can't recommend this one enough. It's basically the same structure repeated over and over: Recount some newspaper clipping of someone going missing (I will grant that a lot of the allegedly-real stories are truly very weird, if they did happen), whip up an explanation out of thin air that supports a vague network of theories about some higher dimension or parallel plane into and out of which stuff (people, cars, invisible bullets) sometimes appears, and then cleanse the palette with a neat little "Well, but who really knows?," all written up in ecstatic and erratic prose worthy of reading in your head in a Rod Serling voice. This is a junk-food kind of book and I would never attempt to play it any other way, but it's a good one.