This book is an astounding piece of scholarship.
Every page is crammed with pin-point analysis of nearly every single book on the topic. Check their bibliography - it's twenty-four pages long. Yes, it's dense, yes, its arguments are heavily nuanced and complex. But of course it is - this is a field that for the last twenty years has been steadily dominated by staid, lumpen critiques with the simplicity of a housebrick, as the authors themselves say in the first chapter, where they state that the complexity of the book is a deliberate, considered response to this.
And frankly it is far more readable than the absurd caricature of the below review suggests, whose author has purposefully picked what they found the most difficulty with to quote. There are some scintillating sentences in this book, not only readable, but with the weight of scholarship behind them, positively uplifting. Consider "...the primary 'recited truth' of crisis politics: that 'race' is a fiction, and racism, when it is discussed is dismissed as a fraught, accusatory moralism", or "The progressive yardsticks waved at migrants, who are always already presumed backward, belies the fact that there are few Western states whose legal practices and clusters of dominant opinion are as liberal as their rhetoric when it comes to feminism and LGBT rights.".
I have yet to find a serious argument advanced about multiculturalism that is not dealt with capably and concisely in this book. It is one of the best pieces of work about the subject that I have ever read, and certainly in the last twenty years. Lentin and Titley should feel very proud of themselves - this is essential reading, indeed a definitive work.