He's written horrors, thrillers and sci-fi odysseys. As his new play about Victorian spiritualism opens, the dramatist explains why no territory is out of bounds for theatre, not even Pluto Alistair McDowall's new play The Glow transports its audience back to the 1860s where Mrs Lyall, a spiritualist medium, is visiting an asylum, searching for someone to act as an assistant. There she finds a strange, nameless, voic…
