Theresa May signs a sticker that was placed inside CJ Sansom's debut novel Dissolution Theresa May took a break from her ongoing Brexit struggles to open a library in a phone box, donating a historical mystery novel by bestselling Scottish author CJ Sansom.The Prime Minister opened the Holyport Book Booth in her Berkshire constituency, taking Sansom’s debut novel Dissolution, the first in his the first in the Matthew Shardlake series, to add to the shelves.The 62-year-old smiled for the crowd as she cut a ribbon to officially open the library, which was the idea of 11-year-old schoolgirl Tate Pickering.Tate was inspired by a question in a mock SATs test, in which people used a redundant telephone box to swap books they have read for new ones.After the phone box in Holyport near Maidenhead, Berks, was bought for just £1 from telecoms firm BT, volunteers worked tirelessly to transform it into a tiny library.Among the books now available to borrow is Mrs May’s copy of Dissolution, which was published in 2003 to rave reviews. Theresa May signs a sticker that was placed inside CJ Sansom’s debut novel DissolutionCredit:Baylis Media/Solent Mrs May signed her name with a Sharpie pen after meeting young Tate and praising her idea. The historical mystery novel is set in 16th Century England during the break down of the monasteries. It follows lawyer Shardlake, who must solve the murder of one of Thomas Cromwell’s commissioners.Before leaving books at the small community library, people sign their name on a sticker which is then placed inside the books cover. Want the best of The Telegraph direct to your email and WhatsApp? Sign up to our free twice-daily  Front Page newsletter and new  audio briefings.