The Q-ship, an ordinary merchant vessel with concealed guns, came into its own during the First World War, when the Royal Navy to trap and destroy German U-boats. Deborah Lake uses a wide range of primary and secondary source material drawn from archives in the UK, Germany and the USA to tell the compelling story of the Q-ships and their U-boat adversaries.

The Q-ship operations themselves will be covered by following the careers of the eight men who won the Victoria Cross on Special Service Operations; and by accounts of German U-boat crews being on the receiving end. No book on Q-ships can avoid the Baralong incident in which a Q-ship's crew allegedly executed the survivors of the German submarine U-27, on 19 August 1915. In a subsequent encounter with U-41, more British atrocities were alleged by the only two German survivors. Revealing extracts from the diary of a Royal Marine who served on board the Baralong are reproduced in the book together with other first-hand accounts. With charge and counter-charge, this incident provides a fascinating story.