Catherine Ryan Howard is an award-winning, #1 bestselling thriller writer from Cork, Ireland. Her work has been shortlisted for the Mystery Writers of America Edgar Award for Best Novel, the UK Crime Writers Association John Creasey/New Blood and Ian Fleming Steel Dagger Awards, and the An Post Irish Crime Fiction Book of the Year multiple times. Her novels have been included in TheNew York Times Best Thrillers of the Year, TheWashington Post's Best Mysteries and Thrillers of the Year, and The Sunday Times (London)'s Best Thrillers of the Year. She is published in twenty languages, and a number of her titles have been optioned for the screen. Catherine's fifth novel, 56Days, won the An Post Irish Crime Fiction Book of the Year and was longlisted for the Dublin Literary Award, the world's most valuable annual literary prize. A screen adaptation starring Dove Cameron and Avan Jogia debuted exclusively on Amazon Prime Video in early 2026. Prior to writing full time, Catherine worked for a travel company in the Netherlands and in Walt Disney World, Florida. She lives in Dublin.