Written by Bush when she was 18, the song is based on the novel of the same name. Kate Bush was inspired to write the song by the last ten minutes of a 1967 BBC mini-series based on Wuthering Heights.She then read the book and discovered that she shared her birthday (30 July) with Emily Brontë. Bush reportedly wrote the song, for her album The Kick Inside, within the space of just a few hours late at night. Lyrically, "Wuthering Heights" uses several quotations from Catherine Earnshaw, most notably in the chorus - "Let me in! I'm so cold!" - as well as in the verses, with Catherine's confession to her servant of "bad dreams in the night". It is sung from Catherine's point of view, as she pleads at Heathcliff's window to be allowed in. This romantic scene takes a sinister turn if one has read Chapter 3 of the original book, as Catherine is in fact a ghost, calling lovingly to Heathcliff from beyond the grave. Catherine's "icy" ghost grabs the hand of the Narrator, Mr Lockwood, through the bedroom window, asking him to let her in, so she can be forgiven by her lover Heathcliff, and freed from her own personal purgatory.