Deep in the rings of an obscure gas giant orbiting an obscure star, a strange phenomenon appears, leaking electromagnetism like a miniature black hole but having no obvious gravitational effect on the rocky debris around it.
The nearest star is obscure, but not uninhabited; the residents of its second planet notice the phenomenon, and send a small team of scientists to get a closer look while they wait for an expert to arrive to examine it. It's the talk of the planet when the scientists' ship ceases all communication, apparently having disappeared entirely.
The next ship to approach the anomaly is smaller, slower, with only two inhabitants; it doesn't approach the anomaly very closely, but, as it turns out, it doesn't need to in order to disappear as well.