[Girchuck]

You need to suspect button of stealing in this situation a vast majority of time. If you presume that the unknown button is stealing here, until you develop reads, it is a smaller mistake than to presume otherwise. You need to discourage stealing, because it increases your variance and because stealing on the button is usually a good play. Discourage the button by three-betting pre-flop because your hand is strong heads up. Then lead this flop.