This book can be read in 2 to 3 hours, without being mentally challenging. Its main goal is to give you an idea of what Scrum means - by the tool of storytelling. It is really just a 110-page story of a CTO who embraces Scrum in a time of desparation and turns things around within a few months. It is well-written and relatable. The main points of Scrum are repeated in a short bullet list after each chapter. This is really useful.