Open Book marks the 50th anniversary of Joseph Heller's bestseller, Catch 22, as soldier turned author Andy McNab and Professor Christopher Bigsby discuss why this 1961 novel remains so popular. We look at the role of writers in residence with Horatio Clare, writer-in-residence for Maersk lines and Naomi Alderman, soon to be writer-in-residence at the Gladstone Library. And literary apps: responding to your feedback on them and looking at what the publishing industry has in store for us in the future.