'I wanted to tell the story of my mother's dementia with humour'
A story that portrays how a daughter copes when her mother descends into dementia sounds a bit of a downer. A book on the subject that has you guffawing every couple of pages and even makes you laugh out loud feels something of a stretch. One that’s illustrated, cartoon-style with thought-bubbles might make you think it’s aimed at children. But wrap it all up in a single package and you have Polar Vortex, a graphic novel clearly intended for grown-ups, that succeeds as a moving memoir, while bei