Books like 21 Proms
David Levithan, John Green, Libba Bray, E. Lockhart, Daniel Parker, Rachel Cohn, Ned Vizzini, Holly Black, Melissa De La Cruz, Sarah Mlynowski, Elizabeth Craft, Aimee Friedman, Jodi Lynn Anderson, Leslie Margolis, Brent Hartinger, Lisa Ann Sandell, Will Leitch, Adrienne Maria Vrettos, Billy Merrell, Daniel Ehrenhaft
21 Proms is 298 pages, about 5 hours 28 minutes at 250 words a minute.
12 books to read next
How long each takes
Speak 4.0 h 
Prom and Prejudice 4.2 h 
Princess in Pink 4.7 h 
This Is Where It Ends 5.6 h 
Lost and Found 2.4 h 
Frostbite 6.0 h 
Be More Chill 5.3 h 
You Don't Know Me 5.0 h 
Let It Snow 6.8 h 
Before I Fall 8.4 h 
The Short Second Life of Bree Tanner 3.5 h 
Just Listen 6.9 h Bar height shows length. Estimated at 250 words a minute.