The best replacement for poirot is holmes.

The best alternatives to poirot are rated as following:
★★★★★  holmes
★★★  sherlock holmes
★★  marple
★★  sherlock
  columbo
  maigret
  miss marple

Your alternative for poirot is not listed? Suggest!
Speaking about poirot, one probably shouldn't forget about miss lemon.

Other search terms related to poirot and their ratings are:
★★★★★ miss lemon
You have in mind a companion for poirot and it is not yet here? Propose!



Google Trends

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poirot
holmes
sherlock holmes