Side Streak

A professional assassin gets a strange call from a rather strange anonymous client and his given a list of targets but it seems like every location he goes to commence, the assassination a mysterious figure arrives and eliminates the target before him almost as if to taunt him. The client is paying a rather large sum of cash so it's hard to turn him down, but each list keeps getting wiped out by the same mysterious figure as it seems a game has begun between the two killers but it's uncertain whether his a hired gun or a psychotic challenger? But one thing for sure it's making his skin crawl getting paid large sums of cash for a kill streak he didn't establish.