CLOUDS OF WITNESS by Dorothy L. Sayers
Read: Oct 31 - Nov 1
Source: Public Library
This mystery with Lord Peter Wimsey and his valet, Bunter, has them working diligently to clear Lord Peter's brother (the Duke of Denver) of a murder charge. The characters include not only the Duke of Denver, but Peter's sister Lady Mary, his Mother the dowager Duchess, colorful villagers, and a few political malcontents.
Again this mystery was written in the early part of the 20th century but it was still entertaining and challenging for the reader.