From the introduction: The year is 1968. Two years ago, on January 7, 1966, an alien energy, now known as THE SIGNAL, reached the Earth. It spread through telecommunications systems, affecting people and technology around the globe. Its existence is not publicly known, though its strange effects have been widely reported. You work for CHAMBER — a secret agency tasked with containing or destroying Signal Resonant Materials (SRMs) — objects imbued with THE SIGNAL — as well as containing its transmission and dealing with people harmed by it (or working to harness its power). You and your cell may employ cover identities as federal agents (FBI, DOE, Marshals, etc.) as needed in pursuit of your missions. Secrecy is paramount. The identity of your superiors is not known to you. You receive written orders for your missions by courier.