It is one of the most astonishing love stories of the Second World War.
British soldier Horace Greasley was so besotted with his German sweetheart he would risk death by Nazi firing squad by sneaking out of his prisoner of war camp to see her.
Removing the wooden bars from his cell window before crawling under the wire fence, he defied his ruthless captors by meeting lover Rosa Rauchback more than 200 times.
Incredibly, Horace – who was famously photographed coming face-to-face with SS Nazi brute Heinrich Himmler – crept back into the camp under their noses each time.
The confrontation was captured on camera by a German war correspondent and the photo is one of the most iconic of the war.
Now his remarkable exploits are being turned into a big Hollywood movie with stars Robert Pattinson and Alex Pettyfer up to play him.
Horace was captured by Hitler’s forces during the British retreat to Dunkirk in 1940. He first met Rosa at a marble quarry labour camp in Silesia, then part of eastern Germany, where she worked as a translator.
When he was transferred to a factory prison, Rosa was heartbroken and pursued him – but she had no access to the lock-up.
So night after night Horace, then aged just 21, risked his life by breaking out of his cell to meet his young lover.
For two-and-a-half years, he evaded guards to meet Rosa in a chapel – before sneaking back into his cell carrying food for his starving comrades. He only returned to the camp because there was nowhere to run as it was surrounded by Nazi-occupied countries.
Horace, from Ibstock, Leicestershire, was liberated on May 24, 1945, and continued to receive letters from Rosa – by then a translator for the Americans.
But the correspondence suddenly stopped and tragically he eventually found out Rosa had died in childbirth not long after he got home. He never knew if the baby was his.
Horace married wife Brenda and the couple moved to Spain’s Costa Brava, where he died two years ago aged 91.
His amazing story was turned into a book called Do The Birds Still Sing In Hell? – which was ghostwritten by Ken Scott, in 2008.
US-based Silverline Productions bought the rights and have hired Mission Impossible III producer Stratton Leopold to bring it to the big screen. Scott is flying to Georgia in the next few weeks for a read-through of the script.
He said: “I can say it will be a mix of German and British actors and they are A-listers. As for the director, they are currently choosing between two. Finally people will see Horace’s amazing story on the big screen.”