After the rich Lord Lebanon has been strangled, a group of different characters assembles at Mark's Priory, his lonely manor in the north of Scotland, to attend the reading of his will. However, as lawyer Frank Tanner explains—in reading a "second-to-last-will"—to the potential heirs, they will first have to stay together at the manor for six days and six nights. Thinking that Lebanon has died of heart failure they all agree. It turns out to be a dangerous requirement as the manor is cut off from the outside world by a storm and one by one the visitors are murdered—strangled with an Indian scarf. In the end, of all the guests, family and staff only Tanner, Isla Harris and Bonwit the butler survive. The last will is read and it is revealed that Lord Lebanon has in fact left all his money to the man he considered to be the greatest of the century: Edgar Wallace.<ref name="Filmportal"></ref><ref name="Magnum" />