Reading progress update: I've read 5%.

‘But then,’ added Mr Morganthal heavily, ‘all the world is mad.’
I've not made a lot of progress last night, but what I can say from reading the first chapter is that I liked it. It has a different feel to it than Dame Agatha's other "thrillers", almost as if it isn't taking itself too seriously.
I hope this is a sign of things to come.