It was an interesting case with a fun twist but there were a few confusing points.
SPOILERS AHEAD
The question of the key (Objective 2) caused a lot of confusion. In his interview, Harry speaks of a single key used to lock up the doors of the house with the implication that he still has it. So it’s confusing when he’s apparently the one who dropped the key to the side drawer. It makes no sense. Julie could have given the key to anyone. Perhaps it was in Alex’s possession and he simply dropped it or knocked it over. The link is flimsy. There is nothing directly connecting the key to Harry.
The question of the woman’s voice in the CCTV footage was baffling and left unanswered. Assuming she was the live-in maid mentioned in the interview (which is never confirmed), why was she awake at 00:00-02:00? And who was she talking to? It’s a confusing point that is never explained.
But otherwise, an entertaining story.