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 & Momfor 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.

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Books on the Undergroundleaves 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.

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

Happy reading, London!