A Disintegration Loop

I am an unsuccessful dectective - so unsuccessful I cannot even spell my own job correctly - with a disabled son. I am attempting to find the killer of a woman in Cambridge, murdered by Lion's Yard, her body found grasping a ladle. Somehow I know the outfit worn by the killer is blue/green/grey and I am compelled to look for evidence in the shampoo aisle of a local supermarket. By chance, over the road, I spot the killer queuing to get in to a Pizza Express. I give chase with my partner, who now exists. The killer leads us to a rooftop which seems to be similar to Hadid's re-imagined transport museum in Glasgow, where my disabled son is intent on killing himself owing to my neglect. We attempt to reach him, but before we can he rolls off the roof. I assume he is dead, but when I am eventually persuaded to look over the edge, in an exchange reminiscent of Brad Pitt at the conclusion of the film Se7en, the chair is empty. What sort of elaborate prank is this? When my partner t