Published in 1946 and set at the end of WWII, this is the third Inspector Cockrill mystery and has also been published under the title, "Suddenly at his residence."
Sir Richard March has kept his house a shrine to his first wife, the beautiful ballerina Serafita, despite marrying his mistress Bella after his wife's death. On the anniversary of Serafita's death, he expects his remaining relatives to gather for a ceremony and he then spends the night alone in the small lodge where she died. In the house on this anniversary is his wife Bella, her grandson Edward (indulged and neurotic) and Sir Richard's grandchildren Peta (daughter of his eldest son who died in WWI and his heir), Philip and his wife Ellen and Claire (who is having an affair with Philip). Into this cast of characters are a grumpy gardener, his wife, an elderly woman who is all the help they have in wartime and a young lawyer, Stephen Garde who is in love with Peta.
Although Christianna Brand indulges in a little too much stereotyping in this book (girlish hand fluttering, etc), if you perservere you will find a great story. Because Sir Richard is not overly impressed with his offspring and when he discovers Philip and Claire are involved with other, it leads to a heated argument and a change to Sir Richard's will which will result in murder. Brand's work, although successful in it's day, has not aged quite as well as her contemporaries, but there is much to applaud here - some of the scenes of family squabbles, disquiet, suspicion and hurt are brilliantly done. The plot itself is complex, the characters interesting and the interplay between them very real - plus the ending is a real surprise. Good to see this author's work released on kindle for a new audience.