As other reviewers have said this game blocks you from reaching the correct solution if you have chosen an incorrect dialogue choice earlier in the case. To proceed you need to select an obviously incorrect solution, or replay the case from an earlier save. This isn't apparent until much later in the case, and is apparently intentional to make it as difficult as possible to achieve the correct solution. If the game was more entertaining then replaying an entire case might be more of an option but listening to the deeply annoying "side-kick" character for a second time is a deal breaker for me. I gave up after case 3..
