By the time you finish your coffee, a few dozen companies already know things about you that you've never said out loud. No one broke in. You let them in, one small, reasonable-seeming permission at a time. The Glass House is a field guide to that quiet, legal, entirely ordinary erosion — and to fixing it without becoming paranoid or opting out of modern life. It opens with the myth that privacy means having something to hide, then follows the actual mechanics: the data brokers stitching your ginger ale purchases and your resting heart rate into a sellable inference, the auction that runs every time a page loads, the phishing call that sounds exactly like your IT department, the zero-day sitting quietly in code everyone already trusts. Real cases anchor every claim — Kochava, the MGM breach, the 23andMe cascade, Snowflake, Polyfill.io — reconstructed from what actually happened, not the movie version. And it doesn't stop at diagnosis. The second half is the fix: encryption explained without the jargon, a working password and 2FA strategy, a fifteen-minute cloud storage audit, and a one-hour checklist ordered by how much real-world risk it removes per minute spent. You are not the architect of the internet. You can still be the architect of your own house — knowing which walls matter, which doors need locks, and which ones you've been leaving open on an ordinary Tuesday morning. Twelve chapters. Four parts. No hacker in a hoodie.