Red Shift is a 1973 fantasy novel by Alan Garner. It is set in Cheshire, England, in three time periods: Roman Britain, the English Civil War and the present.

Tam Lin is a character in a legendary ballad originating from the Scottish Borders. It is also associated with a reel of the same name, also known as the Glasgow Reel. The story revolves around the rescue of Tam Lin by his true love from the Queen of the Fairies. The motif of winning a person by holding him through all forms of transformation is found throughout Europe in folktales.