精神医生Lilian Steiner就自己一个病人的死展开了调查，她相信这是一起谋杀。

A baby in a basket is left on the steps of an isolated monastery on a Scottish island. The nuns take it in, planning to care for it until a storm passes. Soon though, strange and unexplained events begin to happen at the convent.

一桩公交车谋杀案调查展开，各种可能的情节和嫌疑人逐渐浮出水面。随着每个人接受讯问，案件的隐藏线索逐渐浮出水面。