Which is the best book for ethics for UPSC?

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The fact that ethics has consistently ranked among the top-scoring GS subjects on the UPSC examination is also the only explanation for why candidates have struggled to identify the most effective and accurate study method. Therefore, what they are doing is struggling to discover the greatest resources and reading materials, which makes it extremely difficult for UPSC aspirants to find the best potential result. The following are some of the most pertinent literature in this direction:
Lexicon for ethics integrity and aptitude by Niraj Kumar
Ethics, integrity, and aptitude by M. Karthikeyan
Ethics in governance: innovation, issues, and instrumentalities- Ramesh K Arora

Tirthankar Roychowdhary Sir personally leads sessions and workshops on ethics at EDEN IAS, one of the best coaching Ethics for IAS in Delhi, and it’s performing fairly well in this area.