The events of A Fiend in Need take place a month after the end of Maureen Child’s previous book, More than Fiends, when Cassidy Burke discovered that she was a Demon Duster - a kind of Demon Slayer. Her life has become more complicated – albeit much more fun - now that she has a demon lover, Devlin Cole, and Logan, the father of her fifteen-year-old daughter, has also come back into her life.

This story continues Cassie's experiences as a new Demon Duster, but her love life takes an unexpected twist when a Faery turns up at her door asking for sanctuary. He has escaped from the Demon Queen, and only Cassie can keep him safe from the woman who kept him as a love slave. Cassie has rather too much on her plate already; however, what with her other two men, being trained by Jasmine in Demon Dustering, and worrying about her daughter's love life. She finds herself regularly under attack by demons, and it takes all her wits - as well as liberal helpings of chocolate and other goodies - to keep her going.