The author, Munindra Misra is the youngest of the five sons and three daughters of Late Pt. Kanhaiya Lal Misra. He has been honoured with a badge and awarded 'The Top Viewed Author Award' by Knol - A unit of knowledge of Google in 2011.
It has 64 verses (mantras) which are not used in rituals but are teachings of spiritual knowledge.They define higher and lower knowledge, describing Brahman, self, the relationship between world and Brahman and path to Brahman.
The Mundaka Upanishad finally states that knowing Brahman is freedom, fearlessness, liberation and bliss.
If Brahman an infinite ocean, then Atma a wave within be;
Ocean not different from its waves, the waves as ocean be;
They are but one and the same, very similar in actuality;
So Brahman and Atma are one, and the same in reality. ~
Yama Gita describes qualities of a Vishnu devotee. It shows that you are not the body but something beyond - a reflection of and part of Lord and infinity, which can not be created or destroyed. It shows the nature of self 'Atma', the concept of Brahmin and how to attain moksha, liberation - freeing the self from cycle of rebirth.