Exactly how and when was the sandwich invented, and was Benjamin Franklin involved?
Would it be worth making a time travel journey to find out? One man thought so, and wangled his way on to a secret mission in order to satisfy his curiosity - and nudge the course of history in his family's favour.
Two books, written six-hundred years apart, are interwoven to make an intriguing tale of lust, desertion and redemption. Or should that be lunch, dessert and regurgitation?
Also included is a reference source from the year 2015 - essential information for 21st century readers who want definitive answers to the big questions of our time.
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