After working for the Museum, a secret network of assassins, for forty years, Billie and her three colleagues are treated to an all-expenses-paid vacation to celebrate their retirement. Curiously, the four ladies discover they are targeted by one of their own on the cruise ship. To make it out alive, Billie and her besties must transform from prey to hunter and turn against the Museum, even if they have given their entire youth to the organization, even if their skills are no longer appreciated, even if they are sixty years old.

Killers of a Certain Age is a fun, fast-paced, and light-hearted read that features not one but FOUR older women. While the plot is somewhat predictable, reading stories about a different age group is such a refreshing and fun experience. Contrary to James Bond, the four assassins don't use their superhuman strength, fancy technology, or sex appeal to complete their mission of terminating the Museum. Constantly underestimated due to their age, Billie and her friends use this to their advantage throughout the book.

Raybourn incorporates how older women are treated brilliantly with humor; like when people assume they're technologically challenged, speak to them in a patronizing voice, or just straight up ignore them. While ageism, especially against women, is widespread in our society, Killers of a Certain Age offers an entertaining perspective and delightful experience that will have the readers rooting for Billie and her colleagues.