You just installed a package of bees in a brand new hive, but the bees don’t seem settled. You check on them the next day and they are the same. Then on the third day, everything is quiet. No sounds come from the hive, and no big-eyed faces peer through the entrance. When you remove the lid you find the hive is empty with only a handful of dead on the bottom board. What happened? Why did your bees leave? Are they coming back?