In 1999, an unnamed man is recruited into the International Contract Agency and demonstrates exceptional skill as an assassin. His handler, Diana Burnwood, helps him pass a rigged final evaluation, and the man, now known simply as "47," begins his career as a contract killer. Twenty years later, 47 carries out a series of high-profile assassinations that initially appear unrelated. Diana gradually discovers that an unknown figure called the "Shadow Client" has been covertly orchestrating these contracts to strike at Providence, a secretive organization with hidden influence over global affairs. The Shadow Client uses the ICA and 47 as unwitting instruments, concealing his own involvement while making the agency appear responsible for the attacks on Providence's operatives.