A particular circumstance

Charlotte Grayson and her sister Kitty are living with their widowed mother at Westbury Hall, which they are renting from the wealthy Sir Benjamin Westbury. When he returns home unexpectedly, he brings with him his handsome great-nephew Hugo who demands that they leave the Hall.

Then, during a violent thunderstorm, part of the library paneling is broken away, revealing a gruesome skeleton. A murder has obviously taken place, but who was the man buried in the wall and how did he get there? As this gripping story unfolds, past family tensions are revealed and Charlotte puts herself in mortal danger.