Hope you weren’t too bogged down. Here’s the solution in this image. Clue explanations, as usual in the video, which is followed by some notes on the theme.

I’ve read a fair few of Ngaio Marsh’s crime novels featuring Inspector Roderick “Handsome” Alleyn and Agatha Troy, but not all of those which feature in the grid: DEATH And The DANCING FOOTMAN, SPINSTERS in JEOPARDY, COLOUR SCHEME, SURFEIT Of LAMPREYS and FALSE SCENT. There are plenty more for me to look forward to whenever I’m next in the mood for some golden age crime writing.