Space Engineer: Book 5

Hitching a ride to the inner solar system, the Engineer and Grace quietly advance their technologies. Their discovery triggers a change that brings them closer to each other while pulling them further from humanity. On Earth, Valen Techtronica detects an unexpected, sophisticated intrusion from Ceres Station, prompting a search for its origins. Meanwhile, a mysterious new organization reveals themselves to the Engineer and Grace. Can the Engineer and Grace outpace Valen's pursuit, and what of this uneasy, newfound alliance? Will it help them? Or destroy them?