This song tells the story of a woman named Nancy whose face was nothing fancy, but she drives the guys wild anyway. Deep Purple lead singer Ian Gillan
, who wrote the lyric, has given different accounts of the song's inspiration.
In one of his stories, the song is about one of his friends who went after an average-looking girl that didn't like him. He was able to woo her and they got married, but three days later she died.
Gillan has also said it's about a prostitute he tried to liberate from her profession, and has introduced that song as being about "my first girlfriend."