4th century BC. Alexander III of Macedonia has just unified all the cities of Greece. He then embarks on a punitive expedition against Persia. With Egypt conquered and Alexandria founded, Alexander invades the vast Persian Empire of Darius III. Although greatly outnumbered, his troops win victory after victory. After Babylon, Alexander seizes the capital, Persepolis, and Darius is assassinated as he tries to flee. The victory by Alexander, henceforth known as the Great, is total. He steps into history and is now master of the entire known world. Alexander’s generals plead with him to pause before undertaking a fresh campaign: the troops are exhausted. Against all advice, Alexander decides to go on and launches his troops towards India. But the conquest of India is a conquest too far. After yet another victory, the Macedonian army categorically refuses to continue. Even the veterans have had enough. Alexander must resign himself to withdraw—and, stricken with fever during the return journey, he dies at just 33 years of age. A single wrong decision settled the destiny of Alexander the Great.