The novels
The Merkabah Cycle
Hard science fiction with the engineering done first. Before a chapter was written, its flight was flown in a real orbital simulator — the same one validated against five flown spacecraft. Where a mission would not close, the story changed rather than the physics.
The books
Platinum Void begins it: a stranded geologist watches the Hyperion — humanity’s deep-space ship — depart for the dark, and years later sets down the first-contact account it led to. Wheels Within Wheels follows — eleven years after the transmission was sent, the reply arrives, told from the years after by the man who was at the desk when it came.
Start with Platinum Void. Like every title on the shelf, it opens to the first half of its opening chapter, free.
The science is on the table
Nothing about the ship or its flights is hand-waved. The engine that planned every trajectory is open to fly yourself, and the work behind it — the theory and the validation against real missions — is published in full and free to read.