4 ideas
A repeating neutrino signal from space is recorded, and a secret US government project in the Nevada desert assembles scientists, including mathematician Peter Hogarth, to decode it. Hogarth and a colleague then find that it can cause a nuclear explosion at a distance, the 'TX effect.' After years of work, the scientists still cannot say what the message means or who sent it.
A message with no shared context cannot be read neutrally, so each interpreter projects onto it the models of their own discipline, culture and politics. The signal's hypothesized meanings end up as a record of the people interpreting it, and say little about the senders. Faced with the truly foreign, human understanding tends to reproduce itself and call that decoding.
The scientists manage to build a working substance from a small fraction of the message, yet this success tells them almost nothing about what the whole message is. Being able to manipulate the output of a system can create a false sense of understanding, because a correct fragment can be put to use while its purpose stays opaque. The novel treats this gap between technical results and real understanding as the normal condition of science facing something truly new.
Because the project runs under military sponsorship, every result is first judged by one question: could it kill? When the TX effect appears, the scientists' dilemma is whether to hide it, not what it means. They find the effect is too diffuse to aim, and Hogarth speculates the senders may have built in that safeguard on purpose. Seen this way, the institution funding the research shapes which questions get asked about the unknown, and it pushes scientists into making secret moral decisions.