Constantinople: Book 4 of the Changed Course series

By Tony Dunning

The Straits are open. Constantinople stands. An empire chooses survival over alliance.

The impossible has happened.

Against every expectation, Commander Godfrey Herbert's revolutionary underwater craft have cleared the Dardanelles and carried the Royal Navy into the Sea of Marmara. For the first time in centuries, enemy battleships lie within sight of the Ottoman capital.

As British guns wait silently beyond the horizon, Constantinople stands on the edge of destruction.

Inside the city, the Sultan and his ministers face an impossible choice. Continue fighting beside Germany and watch the ancient capital reduced to ruins-or break with their ally and save the empire.

German generals refuse to surrender. Loyal Ottoman troops surround their former comrades. Gunfire erupts in the streets as German headquarters are stormed, the embassy is besieged, and rogue coastal batteries make one final desperate attempt to drag Britain into a catastrophic bombardment.

Beneath the waters of the Sea of Marmara, Herbert's tiny underwater craft undertake their most dangerous missions yet, racing to stop the last German guns before a single shell destroys any hope of peace.

While diplomats negotiate aboard HMS Queen Elizabeth, the fate of nations hangs on the courage of a handful of men. Along the trenches of Gallipoli, exhausted British and Ottoman soldiers prepare for something they never believed they would witness-the guns falling silent.

Far away in Berlin, the German High Command receives devastating news. Without a decisive battle, one of Germany's greatest allies has slipped from its grasp, changing the course of the First World War forever.

Packed with political intrigue, naval warfare, espionage, underwater combat and gripping alternate history, Changed Course: Book Four - Constantinople continues the acclaimed Herbert Programme series, where one decision in 1909 reshapes the destiny of the twentieth century.

The war has changed. The alliances have changed. History itself is changing.

• Format: Paperback
• Language: English
• ISBN: B0HB13TV9C
• ISBN13: 9798188571962
• Release Date: September 2026
• Publisher: Independently Published
• Length: 234 Pages
• Weight: 0.70 lbs.
• Dimensions: 0.5" x 6.0" x 9.0"