An entertaining read (listen, really) and Hannah captures much of the Christie voice. I've been making my way through older Poirots so I've had a point of reference. The revelation of the killer was not a huge surprise, but I get points for the motivation. 
 I'm curious what more we'll learn of Catchpool, and I hope in the next story there's more interactions with Poirot than this one. For a Poirot mystery there was what felt like a rather small amount of Poirot.