Discover new books on Goodreads
Meet your next favorite book

Mark

Add friend
Sign in to Goodreads to learn more about Mark.


Mr. Penumbra's 24...
Rate this book
Clear rating

progress: 
 
  (16%)
"Very interesting. I really want to see where it's going." — Oct 27, 2026 12:57PM

 
Loading...
year in books
Alexandre
5,174 books | 11 friends

Jenn Walsh
221 books | 3 friends

Dominiq...
2 books | 6 friends

Lewis L...
140 books | 22 friends

Janet S...
0 books | 25 friends

Robyn
797 books | 44 friends

Alana S...
171 books | 9 friends

Alina
18 books | 4 friends

More friends…



Polls voted on by Mark

Lists liked by Mark