The Backlist Readathon [march 7-13, 2021] - hosted by jacqiewheeler

Read a middle grade backlist
Middle-grade fiction refers to books written for readers between the ages of 8 and 12, while young adult fiction refers to books written for readers roughly between the ages of 12 and 18. The terms reflect the reading level, world-view, thematic interests, and maturity of readers.

To read a book for this prompt, the book needs to be published before 2021, and have a middle grade reading level. 
All books added
Harry Potter and the Half-Blood Prince by J.K. Rowling

Harry Potter and the Half-Blood Prince

Harry Potter #6

J.K. Rowling

652 pages • first pub 2005 (editions)

fiction fantasy young adult adventurous dark emotional medium-paced
PET by Akwaeke Emezi

PET

PET #1

Akwaeke Emezi

203 pages • first pub 2019 (editions)

fiction fantasy lgbtqia+ young adult dark emotional reflective fast-paced
The Losers Club by Andrew Clements

The Losers Club

Andrew Clements

231 pages • first pub 2017 (editions)

fiction middle grade emotional funny lighthearted fast-paced
Ella Enchanted by Gail Carson Levine

Ella Enchanted

Ella Enchanted #1

Gail Carson Levine

240 pages • first pub 1997 (editions)

fiction fantasy middle grade adventurous funny lighthearted fast-paced
Other Words for Home by Jasmine Warga

Other Words for Home

Jasmine Warga

342 pages • first pub 2019 (editions)

fiction contemporary middle grade poetry emotional hopeful inspiring fast-paced
Greenglass House by Kate Milford

Greenglass House

Greenglass House #1

Kate Milford

384 pages • first pub 2014 (editions)

fiction middle grade mystery adventurous mysterious medium-paced
Goth Girl and the Ghost of a Mouse by Chris Riddell

Goth Girl and the Ghost of a Mouse

Goth Girl #1

Chris Riddell

220 pages • first pub 2013 (editions)

fiction fantasy middle grade funny lighthearted fast-paced
The Tower of Nero by Rick Riordan

The Tower of Nero

The Trials of Apollo #5

Rick Riordan

410 pages • first pub 2020 (editions)

fiction fantasy lgbtqia+ middle grade adventurous emotional funny fast-paced
The School for Good and Evil by Soman Chainani

The School for Good and Evil

The School for Good and Evil #1

Soman Chainani

544 pages • first pub 2013 (editions)

fiction fantasy middle grade young adult adventurous emotional medium-paced
The Apothecary by Maile Meloy, Ian Schoenherr

The Apothecary

The Apothecary #1

Maile Meloy, Ian Schoenherr

362 pages • first pub 2011 (editions)

fiction fantasy historical young adult adventurous mysterious tense fast-paced