SOLVED. Adult Mystery book with Annotations, as if you checked it out from a library - like sticky notes, letters, random things in it. They help to solve the mystery. [s]

[koda *•.*^•]

I’ve never read it, so I don’t know much plot, but it’s a book that has lots of annotations in it that help to solve the mystery throughout. Like as if someone checked it out from a library, left a bunch of sticky notes, letters, random things in it, and returned it—i’ve seen it on booktok before but i can’t find it again.

[Kris]

Cathy's Book (also called Cathy's Book: If Found Call (650) 266-8233) by Sean Stewart - or another book in the Cathy Vickers trilogy?

[Ashley]

S. by J.J. Abrams?

[koda *•.*^•]

SOLVED - S. by J.J. Abrams