When Beatles tour guide Barry Seddon finds a letter written by John Lennon he unearths a clue to solving the greatest mystery in pop music – the whereabouts of Lennon's first musical instrument which has been missing for over 50 years.
But Barry's loose tongue alerts Texan dealer Travis Lawson to the priceless relic. In an attempt to get his hands on the letter, Lawson persuades his beautiful wife Cheryl to befriend the hapless tour guide and win his affections. The race for the Holy Grail of pop memorabilia is on . . .