Returning from Dunkirk, Lieutenant Douglas Tulloch and the Lothian Rifles help defend Britain from the threat of German invasion.
Tulloch feels that all is not right with the battalion. When the Lothians are sent to Egypt to prepare for an Italian attack, others share Tulloch's view, as Brigadier Worthington criticises the battalion's performance in battle.
The Lothians share in O'Connor's victorious advance in Operation Compass, but are sent to Eritrea in early 1941. Can they overcome the malaise that seems to have followed them from Dunkirk, or will the Italian defence of Keren be one battle too many?
THE REGIMENT THAT LOST ITS SOUL is the second book in 'Tulloch at War', a series of historical war novels by Malcolm Archibald.