Sam's guest on this week's Book Club podcast is the historian Tessa Dunlop. Tessa's new book is Army Girls: The Secrets and Stories of Military Service from the Final Few Women Who Fought In World War Two. She tells Sam about how she gathered testimony and formed friendships with the nonagenarian veterans of the Second World War amid the Covid lockdown; about the class-ridden rivalries between the women's services; and how while still not officially in the front line, women during the war nevertheless found themselves in the thick of it.