"I love the idea of Books on the Underground, and it was a pleasure working with the team behind it. Seeing someone pick up my book on a train and start reading it was just wonderful."

"Books Underground is such a wonderful initiative; there is something wholly charming about the idea of free books hidden around the city, eager to be found and enjoyed. I feel very proud to have had my novel, The Fairy's Tale, included. Working with Cordelia and the Books Underground team was an absolute breeze as well, and I'd encourage authors and readers to add a little bit of book fairy magic to their days!"

"I first worked with Books on the Underground on my campaign for The Letter for the King while at Riot Communications - they were supportive, organised and enthusiastic, and because of their willingness to be creative and adapt each 'book drop', it meant I was able to secure coverage with London Evening Standard and BBC Radio London Robert Elms show. I can't recommend them highly enough."

"Books on the Underground are an absolute pleasure to work with and a real addition to any campaign. We were so excited when we could tie in our How Hard Can Love Be? giveaway on Valentine's day! Cordelia and her book fairies did a stellar job at traversing the underground lines and sharing the book love!"

"We’ve been working with Books on the Underground for years and highly recommend them. A guerrilla marketing tactic, it’s a great way to break through the noise and support word of mouth buzz for upcoming new releases."

"The team at Books on the Underground were so friendly, making arranging everything really easy, quick and enjoyable. We loved following our books’ adventures online, and are planning our next project together already. It’s a clever bit of guerrilla marketing that gets more people reading!"

"I am so happy that Books on the Underground exists. It is a genius of an idea and feel lucky to have discovered them when I did. They feel like literary Robin Hoods aka Cordelia and her merry book fairies."