When the Hawking Institute discovers an impossible distortion far beyond Tau Ceti's settled worlds, Captain Daniel Mercer and the crew of the Pathfinder vessel Endeavour are hired to determine whether it is a new jump point.
What they find is stranger: a branching route through space, unlike anything humanity has ever mapped before.
The first path opens into an unknown system with a habitable planet, ancient ruins, buried artefacts, and evidence of a catastrophe on a scale no human civilisation has ever faced. As Endeavour's crew follows the evidence from planet to moon to broken megastructure, exploration becomes archaeology, archaeology becomes warning, and the greatest discovery in human history becomes the beginning of a far larger mystery.
Because Enigma is not just a discovery.
It is a warning from the past.
And humanity has just opened the door.