personally i thought it was cobblers.
some bloke in a car accident decides to take revenge on spoilt girls by renovating their houses to build in secret chambers, then lives with them in secret for a few days and then sneaks out to bludgeon them to death... yeah right.
and what about the bloke wrongly charged? he just got forgotten about in the script, even though in all the cinemas in all of east london they picked the exact right cinema at the exact right time to find him, when the custody police officer just let him out of his cell because he was saying scarey things?. yawn, zzz.
and what was the 'point' of the archive guy?.....
cobblers i say, cobblers!