Deep Storm is a pretty good techno thriller. A crew must use the most advanced underwater drilling technology to reach an anomaly well below the earth's crust in water that would normally be far too deep to drill in. As in other thrillers of the sort, the main character encounters a few reasons to be suspicious, a few things go wrong, things go from bad to worse, and then it all falls apart. The premise of the story is interesting and the pacing is good, but the ending falls flat. If I had never read Child's work with Douglas Preston, I might rate it a bit higher, but I'll say it's good, not great.