《雨中无奈，陌生乘客的温暖邂逅》余弦函数的单调区间

　　A beautiful young woman in the South of France is stalked by, then raped by, a mysterious masked assailant. She shoots him dead soon afterwards and dumps his corpse in the sea. Later, an American investigator turns up, and to her horror he seems to know everything about what she has done......