為秘密暗殺組織Museum賣命超過四十載，四個年過六旬、屆齡退休的女殺手正在度假歡慶退休！ 組織高層卻在此時對四人下達格殺令！看祖母級殺手如何用後輩不屑一顧的各種老招，再加上彼此合作無間的默契，一路殺出重圍，證明自己的寶刀還是未老！ Older 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 by New York Times bestselling and Edgar Award-nominated author Deanna Raybourn. 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-school and no one appreciates what they have to offer in an age that relies more on technology than people skills.