Dr. Henry Lighthouse returns.

The second book in the Lighthouse series follows a new generation of physicians who have never practiced medicine without algorithms — and the old attending who teaches them that the machine changed everything except the one thing that matters: the discipline of thinking for yourself.

The Machine in the Room — Book Two of the Lighthouse series

Artificial intelligence did not invent a single new cognitive error. What it did was give the old errors more power.

In fourteen interlocking cases, The Machine in the Room follows a teaching hospital in the age of AI — diagnostic imaging overlays, sepsis-prediction models, ambient scribes, symptom-checker chatbots — and the physicians learning to practice alongside them. Automation bias, anchoring by algorithm, false reassurance from a risk score, the hallucinated fact that propagates through every note: each case is a story first and a lesson second, tracing how a confident machine can quietly replace the act of judgment.

Dr. Henry Lighthouse returns, older now, with trainees who have never known medicine without algorithms. He does not lecture them about the machines. He asks his questions, waits through his silences, and lets the case do the teaching.

The machine is in the room now. It is not leaving. Neither, the book argues, is the physician — if the physician remembers how to think.

Following The Lighthouse Principle*. Coming 2026.*