"Murder is Easy" by Agatha Christie. A story about a serial killer, and also relatively easy to solve compared to other Agatha Christie novels.
The first chapter gave a succinct backstory to the majority of the deaths in this book, and fresh deaths were played out in subsequent chapters. All these deaths were practically indistinguishable from accidents, which goes to show the kind of genius that the murderer was. The real genius is Agatha Christie of course, both in setting up these "accident" scenes and also in disconnecting all the deaths with the murderer's motive. The extra level of indirection from motive to murder is what made this novel particularly clever.
It's a clever novel, but also relatively easy for people who have read enough Agatha Christie. Majority of the case was being investigated by pretty much an amateur (as opposed to Poirot or Superintendent Battle), so every time the readers are presented with a list of likely suspects, they are most definitely not the real murderer. It's fairly easy to narrow down to one or two candidates around the death in chapter 16, then read on to see how the real solution is revealed in the final act in chapter 21. It was a satisfying turn of events.
This book follows my tradition of bringing Agatha Christie books with me on business trips. Previously, I was saying traveling with "Murder is Easy" on airplanes is possibly a bad idea. So I was watching to see if I would get any reaction from the guy sitting next to me on this airplane, and he was not at all worried.
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