Dennis Lehane is great. His Kenzie/Gennaro series, of which "Sacred is the 3rd novel, is THE noir series of the decade. The writing is smoothe and sure, the jokes are funny, the heroes are sympathetic. Basically, this is an ideal private dick series.
Well, I've praised Lehane enough for one review, now more about the book itself. First of all, as the 3rd book of the series it's better to be read after "A drink before the war" and "Darkness, take my hand". It's not necessary, but it's better that way, at least 'cause some of the previouse events are mentioned and if you read those novels after this one it could ruin some strong plot surprises in them.
'Sacred' finds our heroes on a search for a missing heiress. Of course, when a lot of money is involved, nothing is what it seems, and nobody can be trusted. The plot of the book, while strong, is not very original, but Lehane's writing moves it up to a whole new level. You care for the characters, and that's a major point for the book.
Towards the end of the novel there are some scenes which ring a bit false for my ear, and that's what cost this book a star. Basically, coupled with the plot, it could've cost it two, but the way Lehane managed to use a religiouse cult as part of the novel, without putting it in the center of it, earned him one star back.
Bottomline: Not the best in the series, but still way above most other writers.