I've been away and checked the hives today and two were fine but one of them is missing a queen and has no brood or eggs. This hive has two lower deeps for brood but it lacks any eggs or brood and the deeps are being filled with pollen and honey. I have a queen excluder screen separating the deeps from the upper two medium boxes. One of the mediums is full with honey, the other is half full. There is still a good supply of bees in the hive and they were very calm. Is adding a new queen the best choice to save the hive? I'm concerned about time..