Takes place in England during the 1930's. It's the 2nd novel in the Inspector Wilkins series. 

The Earl of Burford has stars in his eyes when he finds out someone wants to film a talking picture at his country estate starring one of his favorite swash buckler heroes. His wife isn't thrilled at all and now a long-lost relative is arriving at the same time as the star and soon their home is inundated with invited and uninvited guests. Here we go again a house party that leads to the same extra curricular activities as the last one. But this time Inspector Wilkins boss wants Scotland Yard to help out. 

The author as in his last title The Affair of the Bloodstained Egg Cozy just as masterfully weaves this mystery. I found myself following the leads closely to see if I could figure out whodunit before the end of the book, but I couldn't. I am honest in saying both Inspector Wilkins novels will go on my favorite mystery list.