Killers of a Certain AgeOlder women often feel invisible, but sometimes that's their secret weapon. They've spent their lives as the deadliest assassins in a clandestine international organization, but now that they're sixty years old, four women friends can't just retire it's kill or be killed in this action packed thriller. Billie, Mary Alice, Helen, and Natalie have worked for the Museum, an elite network of assassins, for forty years. Now their talents are considered old