A lead-directing double is a double of an artificial bid by opponents. Because the bid is artificial, it is typically safe to double. This bid asks partner to lead the doubled suit. For example, North's 2♣ is Stayman and therefore artificial. So East, anticipating his partner will be on lead, asked for a club lead. North's 4♦ is a fit-showing splinter raise, at which point South bid 4NT Blackwood. When North responds 5♥ showing two aces, East doubles to ask for the heart lead. This may be done, for example, when East is void in hearts.