A Monster Calls is a low fantasy novel written for young adults by Patrick Ness illustrated by Jim Kay and published by Walker in 2011. Set in present-day England, it features a boy who struggles to cope with the consequences of his mother's illness. He is repeatedly visited in the middle of the night by a monster who tells stories. Dowd was terminally ill with cancer when she came up with the idea for the story, and died before she could write it.

Siobhan Dowd was a British writer and activist. The last book she completed, Bog Child, posthumously won the 2009 Carnegie Medal from the professional librarians, recognising the year's best book for children or young adults published in the UK.