Dean is resting in Las Vegas and out of the blue, he receives the invitation for Sam's wedding. Further, the wife-to-be is Becky Rosen. Dean is sure that there is some sort of black magic involved but he cannot prove or find any evidence. Meanwhile there are two freak murders in the city and Bobby sends the odd hunter Garth Fitzgerald IV to team up with Dean. Soon they discover that the demon Guy is luring his victims with greedy pacts to get their souls in fake accidents.