Can you handle mornings without a brew? No? Multiply that. Imagine an entire population under a cloud of lethargy, unable to kick start their days.

Now introduce coffee.

Bingo. The brain moves into over-drive and it's time for empire building.

So goes Stewart Lee Allen's crazy theory.

Only thing is, after retracing coffee's journey to world domination - by train, rickshaw, cargo freighter and donkey - he has plenty of evidence to back it up.

Stewart Lee Allen has filtered out the richest beans from coffee's hot and frothy history . . . serving up a steamy, high-energy brew that will stimulate you more than a triple-strength espresso. As they might say in Starbucks: 'Enjoy.'