Were you paying attention on your commute this morning? Because while you were keeping your head down, avoiding all eye contact and generally wishing you were anywhere but on the Central line you might have missed something really special.
Harry Potter star Emma Watson has been sneaking around the tube network hiding copies of Maya Angelou's novel 'Mom & Me & Mom'.
The book is Watson's current choice for her online book club Our Shared Shelf, which sees readers from all over the world discuss a new feminist novel every two months. And she's been hiding copies of the book as part of the Books on the Underground project.
Each book also contains a hand written note from the UN Goodwill Ambassador and HeForShe campaigner, who has been doing a stellar job as a Books on the Underground Book Fairy. They have been popping up all over the place.
Lucky commuters who find a book are encouraged to read it before leaving it on the tube again for someone else to enjoy. In total there are 100 copies of the book somewhere on the Underground.
Better keep your eyes peeled on the way home...