Orphan X Series by Gregg Hurwitz

Orphan X (2016
Buy a Bullet (Short Story) (2016)
The Nowhere Man (2017
Hellbent (2018)
The Intern (Short Story)
Out of the Dark (2019)
Into the Fire (2020)
The List (Short Story) (2020)
Prodigal Son (2021)
Dark Horse (2022)
The Last Orphan (2023)
The Recital (Short Story) (2023)
Lone Wolf (2024)