And he never, ever does.

His roommate had borrowed his copy of Harper’s Illustrated Biochemistry , 25th Edition, and returned it with what looked like coffee stains, tequila, and existential despair all over Chapter 7 (Lipid Metabolism).

The dorm room was empty. His roommate was still at his girlfriend’s place. The clock read 2:48 AM—only one minute had passed since he’d clicked download. Leo exhaled a shaky breath. Just a hallucination. Sleep deprivation. It was fine.

He opened it.

Leo typed: Who wrote this?

The PDF whispered from his screen: “Turn to page 412. The one your roommate spilled Jose Cuervo on. Read the footnote.”