The Mysterious Mr. Quin by Agatha Christie
The Mysterious Mr. Quin is a collection of short mystery stories, by they're a slight departure from Christie's norm. Mr. Satterthwaite, is upper class, single, a man who loves his comforts and is rich enough to afford them. He enjoys life's dramas, watching rather than participating. Satterthwaite is both the main character and the sidekick. It's his reasoning and actions that solve the mysteries, but it's Harley Quin who mysteriously show up at just the right time, asks just the right questions. Mr. Quin is a touch supernatural, he seems to intercede on the behalf of the dead, those whose mysteries still need solved.
These stories are not typical Christie. They're more romantic, with love often triumphing. They're a little dreamy, the plots don't have the precision of Poirot, but the conclusions do seem logical. It's a good collection, but not necessarily what I'm looking for when I'm picking up a Christie.
And I have to say I like this Harley Quin better...