Book calls - KarmaYoga - as a "Selfless Work". He defines Karmayoga on the basis of BhagvadGita, then traces its different interpretation in vedanta and bhakti literature. And then towards the end, it gives practical tips to make work "Selfless" or how do one follow KarmaYoga.
Chapters are small - just 2 or 3 pages, but they are succinct and in-depth. Though the book is small, it demands lot of focus and concentration to read.