If you are familiar with the characters Harry Bosch and Terry McCaleb, there is really no mystery here. But, as they say, it's not the destination that is important, but the journey itself. Connelly's writing is fast paced and streamlined. We are not given large doses of non-essential information just to prolong the story, as happens with quite a few other authors these days. We learn a little more about Harry but he remains a mystery, and that is the hook. A journey well worth the effort.