Challenge accepted.
You do like Christian Bale's character in The Prestige and put on the most amazing "transported man" act the world has ever seen. Of course this requires one of you to remain disguised at all times to preserve the illusion that there's only one of you. You work together flawlessly, alternating which one gets to be the "real" you.
It all goes swimmingly until your fame attracts the spite of a rival magician, who hires people to follow and spy on you, and others to harass you. Things are further complicated by the rival magician's hot assistant, with whom you--both of you, unfortunately--fall madly in love. You resolve not to let a woman come between you, but soon realize that she has fallen for you as well. She presents you with a scheme to whack her magical asshat husband so you can split his estate and be together. This sounds great, if she can be trusted, but would give away the game that you're actually two people.
You and you decide to take her up on the offer--her husband is an ass who doesn't appreciate nor deserve her, and his increasing harassment is in likely to uncover your secret if allowed to continue. You devise a plan, only part of which you share with her for obvious reasons, and tell her that you'll "take care of the details, don't worry about it, the less you know the better". She agrees and arrange for all three of you (her, her husband, and you) to meet for drinks.
What she doesn't know is that one of the you's will execute Mr. Asshat while the other is in full view of several bystanders, providing an iron-clad alibi that you weren't the murderer.
What one of the you's doesn't know is that you're being set up by the other you, so when the hit happens, you A is actually set up and framed by you B. Asshat dies, one of you's gets dragged off to jail for his murder, screaming some gibberish about a duplicate of you having set you up, and is summarily tried, convicted and executed for the crime. The other you gets the girl, splits her late husband's fortune, retires your existing act, and goes about his merry way free from harassment and secure in the knowledge that for legal purposes, he's already been sentenced and put to death for murder and can't legally be tried twice for the same crime.