Disaster lies over Castle Darkwood. While the castle owner is still fighting his imminent death, the family is already fighting over his heir. Shortly before his death, he changes his will to the benefit of his daughter, who should continue the girls school in the Castle, and his granddaughter Gwendolin, who shall inherit the entire fortune. Both sons go out empty. Thereupon ill-fated things happen: the girls disappear, a shrouded monk shape spooks through the dark park, people are found strangled to death by a whip: This is a case for Scotland Yard's finest! Inspector Bratt comes to solve the mysterious happenings... 　　译文(2): 灾难笼罩着黑木城堡。当城堡的主人还在为他即将到来的死亡而战时，家族已经在为他的继承人而战了。在他去世前不久，他改变了遗嘱，为了女儿的利益，女儿应该继续在城堡的女子学校，他的孙女格温多林，谁将继承所有的财产。两个儿子都空手而归。于是不幸的事情发生了: 女孩们消失了，一个裹着布的僧侣形状的幽灵穿过黑暗的公园，人们被发现被一条鞭子勒死: 这是苏格兰场最好的案例！布拉特探长来解决这些神秘事件。