The book "Intercom on Customer Engagement" explores the importance of engaging with customers in a rapidly changing business landscape where monthly payments and easily cancellable services have made engagement crucial for survival. The author's thinking on engagement has evolved, particularly with Intercom's flagship product Engage, which now includes Smart Campaigns for automating high-impact message automation. The book covers key aspects such as identifying the right people to communicate with, crafting effective messages, and choosing the right medium and cadence. With the stakes being high in today's competitive software market, the book aims to provide a universal solution by sharing Intercom's latest thinking on how to strike the balance between communication and growth.