What's the Name of That Book??? discussion

A book series about a nameless assassin operating in Europe. I've read two
of the books in the last 5 or 6 years.

The series is set in modern times, not a world war two thriller.

The assassin is nameless, operates in Europe but in the last book, if I
recall correctly, he comes to the US because he's been entangled by a US
intelligence agency.

Maybe it's on one of these lists:

https://www.goodreads.com/list/show/2...

https://www.goodreads.com/list/show/1...

Does the assassin have a codename?

Who does he work for? Can you give examples of his victims/targets?

Is there any romance in this series?

Grace, are you still looking for this or did you find it?

No response, Abandoned.