The ancients determined the seasons based on the direction pointed by the Big Dipper. Today, we have a new Big Dipper, spanning the skies above us, becoming our "eye in the sky," safeguarding national security and serving society and the people's well-being. This is the BeiDou satellite navigation system, independently developed and built by my country. The novel depicts the arduous and magnificent construction process and the growth of each individual along the way. Like the Big Dipper, they shine like a starry sky.

Thick fog hangs over the airport, international flights are delayed, and an ace agent from the Space Survey Agency navigates a polar vortex. Enduring severe turbulence, his passport expires, and his luggage is lost, he finds his own body on the baggage carousel, clutching the pendant of his ex-girlfriend, whom he had just met thousands of miles away in New York City. On the tarmac, at the airport control tower, in the cockpit, in the first-class cabin, even on communications satellites... Mysteries unfold in every corner of the sky and on the ground. Who is behind this? Under the vast sky, when will the mystery lift?