Under Circumstances: a UsUk fanfiction

22 year old Arthur Kirkland is a dangerous man. An assassin, to be exact. Yes, that's right dear reader. He's paid by the FBI to go and take down difficult criminals that are uneasy to catch. However, he soon receives a mission that may change his life forever. Hitman Jones, a top class criminal that has been hunted for nearly three years now is now Arthur's new target. At only 20 years old, Jones has killed numerous people and has stolen many priceless artifacts to sell. However, as intimidating as the job may sound, Arthur takes the job confidently. Now it is up to him to take down the one and only Hitman Jones... That's only if Jones doesn't take him down first....