I found this to be a concise, readable, and even-handed account of the development of the Catholic Church's Mass, beginning with the early Church and ending amid the current, post-Vatican II liturgical debates. It's concision means it examines only the tip of a very large iceberg, which sometimes led to its account feeling simply like a string of discrete historical events whose relationship with each other is not immediately clear. This is probably unavoidable, though, in reducing a 2,000-year history into less than 150 pages, and Lang does inject some intriguing interpretative comments that have led me to want to read more of his work. He also ends with a brief, diplomatic assessment of the Church's current liturgical landscape that I found clarifying in comparison with the heated polemics that this topic often inspires. Lang's position seems most aligned with Pope Benedict XVI's notion of a "reform of the reform", beginning with a return to the broad principles of Vatican II's Sacrosanctum concilium, with an eye to gradual, organic, and even decentralized development rather than sharp breaks with tradition by decree.