If you're design goal was to make the sleuth more than a one level dip, then I don't think you succeeded. You have two 1st level features and one 3rd level feature that is neat, but probably not enough for someone to decide to take a three level dip instead of a one level dip.
These are class features that do not scale or improve. The character gains the ability and that is the end of it. Introducing a class feature that improves with level will do a better job of getting someone to stick with the class.