Three Act Tragedy

This book is different from the other Hercule Poirot mysteries I've read so far due to 3 reasons:
1. There is no Hastings
2. Hercule Poirot does not properly come into the picture until well after 100 pages
3. The bulk of the investigation or questioning suspects falls on the other 3 characters instead of Poirot

Initially, I felt pretty bored in the first half of the book since the other characters did not possess the method with which Poirot investigates and questions. Also, I terribly missed Hasting's narration style and remarks throughout the story. But as it progressed, and as Poirot took the centre stage again, my interest piqued. Of course, the ending was nothing short of what you would expect out of a Agatha Christie book! Absolute thrillfest; and indeed an interesting motive this time.