Arthur doesn't think he will ever have to return to the strange house that nearly killed him on Monday -- the house that contains an entire world. But Tuesday brings new challenges -- in the form of an enemy named Grim Tuesday, who threatens the well-being of both Arthur's family and his world. Arthur must retrieve the Second Key from Grim Tuesday in order to save everything -- an adventure that will include stealing a Sunship, surviving a very weird work camp, befriending a bearlike spirit, fighting the voidlike Nithlings, and traveling to the scary Far Reaches for the ultimate showdown. 亚瑟从来没有想到，自己会再回到那间，在星期一差点要了他的命的屋子，然而，这个屋子却包含了所有的东西。 在一个叫做贪念星期二的敌人面前，亚瑟和他的世界受到了恐吓，同时也伴随着新的挑战。 亚瑟必须从贪念星期二的手里，拿回第二把钥匙，以此来保护自己的世界。 新的冒险即将展开，包括盗窃太阳船、拯救奇怪的劳动营、帮助熊人的灵魂、远行到遥远的河流等等…… 最后，亚瑟能顺利夺回钥匙，拯救世界吗？