Series 9 Episode 4 discussion

[Tea Lady]

Bit of a coincidence that Lucas' phone rang just before his house was broken into, don't you think? What if he was being watched by 5 and that was Lucas' tip off that Vaughn was breaking in? Also, just before Maya appeared downstairs in blue shirt, it really sounds like the front door of his flat opens and closes. What is that noise, if not his front door?

So I wonder if Harry tips Lucas off, Lucas goes downstairs and acts surprised to find the photo. Vaughn is stuck in the house somewhere unable to get out. Vaughn gets Maya to let him out through the front door. Lucas hears the front door go and grabs the knife thinking he is still in the house.

Just a thought anyway.