She was a 34-year-old graphic designer in Barcelona, recovering from a slipped disc and a broken engagement. Her physio had recommended yoga, but the studios were expensive and she was stubbornly self-sufficient. So she hunted. A free PDF of the "definitive" yoga bible. The one that promised to realign body, mind, and spirit without the €20 price tag.

One bridge mended. One severed.

The first page was not a table of contents. It was a warning, handwritten in a looping, sepia-toned script: