After four decades working as elite assassins for a clandestine international organization, sixty-somethings Billie, Mary Alice, Helen, and Natalie are sent on a cruise to mark their retirement. But when Billie recognizes a fellow agent on the ship, they realize they're being targeted by their former employer. The foursome will have to use all their experience and wiles to survive, and the invisibility of women of a certain age might just be their greatest advantage. Thrilling, witty, and tons of fun, Killers of a Certain Age is a wild ride you won't want to miss!