There are a few errors with the writing in terms of grammar and composition. I don't normally notice such things but some of them just seem to stand out for me. There was one part where the things Henry and Tim said seemed to be mixed up. I agree with David Roth that certain phrases are used repeatedly.
For the story, it feels a bit far fetch as everybody is so willing to tell Henry everything and except for one person, everybody tells the truth. It feels like the whole story is made up of conversations between Henry and other people. There are several mentions of Henry being good at profiling people but I don't see any profiling being done on either the victim or the suspects.