Gravity Falls inspired reading challenge! - hosted by teghans_tomes

A book where a journal has significance
Any book where the MC(s) makes, uses, and or finds a journal and it is an important part of the book. A book where a book is an integral part of the story (like A Study in Drowning or The Book of Living Secrets) also works for this prompt.
Think Emily Wilde's Encylopedia of Faries, A Study in Drowning, The Book of Living Secrets, The Frugal Wizard's Handbook For Surviving Medieval England, Gallant, etc. 
All books added
The Slippery Slope by Lemony Snicket

The Slippery Slope

A Series of Unfortunate Events #10

Lemony Snicket

337 pages • first pub 2003 (editions)

fiction middle grade mystery adventurous funny mysterious fast-paced
Dear Mothman by Robin Gow

Dear Mothman

Robin Gow

5 hours, 7 minutes • first pub 2023 (editions)

fiction lgbtqia+ middle grade poetry emotional reflective sad medium-paced
Gone Girl by Gillian Flynn

Gone Girl

Gillian Flynn

19 hours, 57 minutes • first pub 2012 (editions)

fiction mystery thriller dark mysterious tense medium-paced
Root Magic by Eden Royce

Root Magic

Eden Royce

9 hours, 54 minutes • first pub 2021 (editions)

fiction fantasy historical middle grade adventurous dark mysterious medium-paced
Gallant by V.E. Schwab

Gallant

V.E. Schwab

334 pages • first pub 2022 (editions)

fiction fantasy horror young adult adventurous dark mysterious medium-paced
More...