Old Guard book 1: Opening fire

Old Guard book 1: Opening fire – Old soldiers never die and some of them don’t even fade away. Cursed with immortality, Andromache of Scythia and her comrades-in-arms ply their trade for those who can find and afford their services. But in the 21st century, being immortal is a difficult secret to keep, and when you live long enough, you learn that there are many fates far worse than death.

Now as a Netflix original film! The Old Guard refers to a small group of people who are near immortal,

they have lived lifetimes and just not died.
They are sort of like a secret society of mercenaries.

Only a few people know of them and they try to keep it that way.

A well written action oriented story!