Perhaps the most interesting aspect of this (and one I haven’t seen any discussion of) comes with the question of where Harper actually is. At one point she says the house is in Hertfordshire, a little north of London, but when we see her driving there the road signs indicate she’s heading west; the M4 motorway, running that direction, is also mentioned, and the house itself visually belongs in the Cotswolds. Yet she also says it’s a four-hour drive from London — a lot longer than it would take to reach either Hertfordshire or the Cotswolds — and when she gives Riley the postcode, it begins with HL. In reality, there’s no HL postcode area in the UK, but if there were one for Hell, it might well use those letters… right?