Secret Adversary, The

This is Agatha Christie's second ever mystery book (after 'The Mysterious Affair at Styles') first published in 1922. The story begins on the Lusitania, when a young woman - Jane Finn - is given some secret papers before getting aboard a lifeboat. Four years later, young Thomas Beresford and Prudence Cowley meet up in London - both broke and unemployed. Retreating for tea and cakes, they decide up...