The conjecture made in Tsinober and Levich (1983) was that coherent structures should possess a significant coherent helicity.

Wheel that trolley over here, would you?

She's poisoned him against all his old friends.

But a personal and almost menopausal crisis brings him back to an Edinburgh he hardly recognises. As if in a Sergio Leone film, Renton has an obscure need to return, to confront the demons of his past, in particular the three guys he ripped off after a drug deal at the end of the last story.