The textbook "Invariant Subspaces of Normal-Like Operators" by Kulwinder Singh Parmar addresses a central problem in operator theory known as the Invariant Subspace Problem. This problem deals with the question of which operators on a complex Banach space X possess non-trivial closed invariant subspaces. Despite extensive research and significant advances in functional analysis, this problem has remained unsolved for over half a century. The book provides a comprehensive analysis of the topic and highlights the challenges that researchers face when studying these operators. It is aimed at students and professionals who wish to gain a deeper understanding of operator theory and its open questions.