A Sting In The Tale (Jonathan Cape) by Dave Goulson
Under Another Sky (Jonathan Cape) by Charlotte Higgins
Return of a King (Bloomsbury) by William Dalrymple
Margaret Thatcher: The Authorized Biography (Allen Lane) by Charles Moore
Empires of the Dead (William Collins) by David Crane
Submissions for the 2015 prize are now open until 24 June 2015.