Integration. The Vanguard Sequence, #1

The mission was supposed to be historic. A flyby of the Moon's far side. A triumph of human ingenuity beamed live to a watching world. Commander Nathan Carver - decorated Navy veteran, precision-built astronaut, emotionally hollow husband - had spent years engineering every variable into submission. The one thing he never accounted for was the signal. Deep in the shadow of the South Pole-Aitken Basin, the Vanguard I crew detects something that shouldn't exist: a geometric pulse buried in the lunar regolith, its intervals following a Fibonacci sequence.
Not a geological echo. Not a solar reflection. A message. And the moment they acknowledge it, something on the far side of the Moon acknowledges them back. What begins as a controlled scientific anomaly rapidly unravels into a first-contact event that none of the crew's training prepared them for. One by one, the four astronauts - methodical Commander Carver, charismatic pilot Darius Blackwell, razor-sharp engineer Elena Voss, and idealistic mission specialist Julien Moreau - find themselves changed.
Not in ways visible on a medical scanner. In ways that rewrite what they are. By the time Vanguard I returns to Earth, the crew carries something home with them. And Earth is already beginning to answer. When a global event known only as The Integration rewrites the rules of human existence - sorting every person alive into a System of skills, stats, and survival rankings - Nathan Carver must confront a brutal truth: the mission never ended.
It only changed planets. With interdimensional portals tearing open across city skylines, nightmarish creatures pouring through, and a world fracturing between those who adapt and those who are erased, Carver must become something he was always afraid to be - not just a commander, but a leader. Even if it costs him the last human thing he has left: his marriage, his grief, and the fraying memory of the man he was before the Moon spoke back.
The Vanguard Sequence begins here.