Thomas P. Manning, businessman and chess expert, mysteriously shot in a locked room, dies clutching some chess pieces. Police are baffled, and finally abandon the case. Six months later, victim's daughter Leah Manning, stung by a scurrilous book about the case, enlists the aid of Charlie Chan and Number 3 Son. Additional murders follow, leading to a climactic confrontation in a...

十七世纪的瑞典女王克里斯汀，为了逃避政治婚姻，她在乡间骑马时找到了心上人——新任西班牙大使安东尼奥。为了进一步了解他的底细，克里斯汀乔装成男性打扮到安东尼奥下榻的旅馆。两人结交成好友之后，女王才表明真正身份，二人以情侣关系共渡两天缠绵时光。其后，克里斯汀在皇宫正式接见安东尼奥，但私下仍秘密幽会，可惜他们的爱情无法见容于众，克里斯汀虽然决定为了爱情放弃皇位亦无法阻止悲剧的发生。