If it weren't for an argument over lumpy mashed potatoes, Jimi Hendrix may never have crafted one of his most famous songs. Kathy Mary Etchingham was an apprentice hairdresser living in London when she met Hendrix in 1966. The two were introduced by Etchingham’s best friend who was dating Eric Burdon, lead singer of the Animals, and the attraction was immediate. The couple lived together for three years: the longest relationship in Hendrix’s short life. But it was a turbulent romance, marked by constant fighting. And one quarrel in particular would lead to one of the most mysterious rock songs...