We have three copies of Zeppelin Inferno, The Hitler Assassination Attempts and Behind Enemy Lines with the SOE up for grabs with three winners getting one copy of all three titles.
The prizes have been supplied thanks to the generosity of specialist military book imprint, Frontline Books. You can see the wide range of book titles on their website here.
The three competition winners will be drawn at random from those with the correct answer. All you have to do is answer the question correctly.
Closing date: 04/08/2022