Alia was a grad student, poor in funds but rich in curiosity. She opened to a random page—Chapter 7, Non-Isothermal Reactor Design. But tucked between the Arrhenius plots was a letter, brittle as dried leaf.

Dr. Alia Verma stared at the cracked spine on her desk. Chemical Engineering Kinetics , J.M. Smith, third edition. The pages had the color of steeped tea and the faint smell of her grandfather’s study—cigarettes, camphor, and ambition.

She’d found it in the abandoned basement of Old Chem Hall, tucked behind a steam pipe, wrapped in a yellowed lab coat. Inside the front cover, handwritten in fountain pen: J.M. Smith – 1968 – If lost, return to Reaction Lab 4 .