The Otherworld Engineer

David Chen kept pressure systems alive for a living, and a swapped spec sheet killed him: the relief valve was rated for 150 psi, and the men who owned the paper had decided the fix cost more than the odds. He woke on a straw pallet in a medieval forge, in the body of a young blacksmith's apprentice named Dav, in the kingdom of Thorne — where the Iron Guild decides what may be built, the Church of Divine Light decides what may be known, and a machine that moves without a horse is heresy worth a bonfire.

What he kept was the gift of his trade: an engineer's lifetime of mechanisms, tolerances, thermodynamics, and the habit of asking why a job should take twenty minutes when five will do. A batch furnace doubles the workshop's output in a single morning. A hand-cranked pump drains a cellar that has flooded for six months. And behind a false wall of stacked firewood, he and his master Gareth raise the machine the sketchbook was hiding — a steam engine, the first in Thorne in fifty years, since the guild and the Church burned a smith named Heron in the town of Millford and buried his ideas with him. Heron hid his last design where only a smith would think to look, and David means to find it.

Because this is a war over who owns knowledge, and David intends to lose it — to everyone. Every machine he builds gathers allies: Gareth, who risks the only life he has; Elspeth, an herbalist whose mother burned for practicing medicine, and who out-argues David at every turn in a slow-burning courtship; Tom, a weaver's son with a smashed loom and a gift for organizing the overlooked; Lord Ashford, who bets his family's fortune on a royal charter and a factory built in plain sight of the road. Against them stand Grand Master Halden, who buys informants with gambling debts, and Inquisitor Marcus Flame, who preaches that steam is unholy fire while his own Church works the same machines in secret beneath the cathedral and sells the output as miracles.

David fights the way an engineer fights: with evidence, with exhibitions, with arithmetic. Steam pumps drain a drowning city in three days and turn a suspected heretic into a guest of the crown. A stolen vault of hidden technology becomes a public trial. A blacksmith's rebellion becomes written law, then a railroad, a telegraph, a steamship — and a race to finish what Heron started before the League of the Divine Vigil, forty kingdoms of grain and one long patience, snuffs the fire out for another nine centuries.

Expect working machines and real engineering: dies, pumps, locomotives, turbines, a calculating engine that thinks in punched cards. Expect sabotage, embargoes, blockades, courtroom duels, and a found family of stubborn adults — every character in these pages is grown, and the romance, though it burns, always closes the door before the lamp goes out. No status windows, no level screens, no game menus: just a dead man's second life, a kingdom that burns people for knowing things, and one stubborn conviction — that nobody should have to die for a gauge reading.

The fire is banked. It is not out. Leave the world hotter than you found it.