While I quite liked the premise and plot of this book, I couldn't get over the many incorrect details. If you're going to set a novel in real places then do a modicum of research. It's not Brentford in Essex but Brentwood (and it can't have been intended to be a fictional town as it mentions Shenfield as being on the outskirts). The reference to shots being fired being unusual 'even in Brentford' was bizarre, as Brentwood isn't exactly known for its gang culture. There is no 'Chelmsford Hospital' - there's Broomfield and until recently St John's, but neither is within walking distance of Cafe Rouge, across a 'central park'. The Chelmsford & Essex Hospital is within walking distance (although not across a park), but has no acute inpatient beds. The shopping mall near 'Braintree Parkway' station, presumably supposed to be Freeport, is described as an undercover centre, like Lakeside, with standard chainstores like Superdrug. Freeport is in fact an outlet village. So many silly errors that could easily have been picked up (surely the publisher should have done this if the author was too idle) made me very sceptical of the details of synaethesia, the central plot device, and made it impossible to suspend disbelief. Maybe you are less pedantic tham me and woudn't let it spoil your enjoyment, but it got right up my Essex nose . . .