Catherine Ryan Howard is an award-winning, no. 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 had been included in the New York Times Best Thrillers of the Year, the Washington Post’s Best Mysteries and Thrillers of the Year and the Sunday Times Best Thrillers of the Year. She is published in 20 languages and a number of her titles have been optioned for screen.

Catherine’s fifth novel, 56 Days, a thriller about a couple locked down together in Dublin that Catherine wrote while she was locked down in Dublin in spring 2020, 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 will debut exclusively on Amazon Prime Video in 2025.

Prior to writing full-time, Catherine worked for a travel company in the Netherlands and in Walt Disney World, Florida. She lives in Dublin.