Deborah O'Toole is the author of more than seventy books in multiple genres. She is author of Celtic Remnants, The Crypt Artist,  Glinhaven, In the Shadow of the King, and Mind Sweeper.

Writing as Deidre Dalton, she is author of the Collective Obsessions Saga, an eight-part series which chronicles the lives of two families sweeping a span of more than 150 years, all set against the backdrop of a Gothic seaside mansion in Maine. She is also author of the Bloodline Trilogy, which follows the magical journey of three women through time.

Writing as Shenanchie O'Toole, she is the author of thirteen cookbooks and more than forty titles in the exclusive Food Fare Culinary Collection.