LONDON — What could be better than a free book?

A free book with a note inside from Emma Watson, duh.

On Tuesday, Emma Watson played a new role — book fairy of the London Underground. She left copies of Maya Angelou's Mom & Me & Mom for commuters to find and enjoy:

The British actress and social activist left the books as part of a collaboration with her feminist book club initiative, Our Shared Shelf, and Books on the Underground.

I've been hiding copies of Mom & Me & Mom for @booksontheunderground on the tube today! See if you can find one tomorrow! 📚👀 @oursharedshelf A photo posted by Emma Watson (@emmawatson) on Nov 1, 2016 at 2:29pm PDT

Books on the Underground leaves books hidden in plain sight in Tube stations around London on a bi-monthly basis. After finishing the book, readers are encouraged to return them to the Underground for another person to enjoy.

Copies of the #OurSharedShelf read Mom&Me&Mom travel the tube today, with a special something inside from @EmWatson pic.twitter.com/uQs1eZbkPo — Books Underground (@BooksUndergrnd) November 1, 2016

Mom & Me & Mom will be hidden on Tuesday and Wednesday. So that means a total of 100 copies floating around the Underground.

Happy reading, London!