Einstein's Enigma or Black Holes in My Bubble Bath is a humourous and informal rendition of the story of gravitation theory from the early historic origins to the latest developments in astrophysics, focusing on Albert Einstein's theory of general relativity and black-hole physics. Through engaging conversations and napkin-scribbled diagrams come tumbling the rudiments of relativity, spacetime and much of modern physics, narrated with high didactic and literary talent, and each embedded in casual lessons given by a worldly astrophysicist to his friend. Join the intellectual fun and exalt in the frothy ideas while vicariously taking relaxing baths in this magical bathtub. Prof. C.V. Vishveshwara is a renowned theoretical physicist, who participated in the golden age of black-hole physics, making pioneering contributions. Also an enthusiastic teacher and planetarium director, he has written several popular-level articles, scripts for planetarium shows and produced documentary movies on science.