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Headline has launched an online app to celebrate the publication on Valentine's Day of Shadow of Night by Deborah Harkness, the sequel to A Discovery of Witches.
The free All Souls app offers interactive tours of Oxford and London, which feature in the two books.
The tours can be accessed via smartphone or tablet, or from a desktop computer on www.allsoulstour.com. Extra content including author videos, extracts and a competition to enter a character's wine cellar can be unlocked across each city by logging into the app with an email address or Facebook account.
The app is being promoted in London and Oxford with more than 80,000 postcards in arts venues, cafes and cinemas across the cities.