C onnor Allen’s autobiographical show features plenty of smoke and mirrors, literal and figurative. Smoke swirls from a pit on a darkened stage, jagged mirrors stand like rocks across it. It is an emotionally anguished play featuring a mixed-heritage protagonist (played by Allen) who has been abandoned by his Jamaican father and raised by his Welsh mother. His inability to forgive his father takes him back to Jamaica where he experiences a psychic watershed. This twister of a drama shifts ambitiously in form and tone, sliding between gothic thriller, family psychodrama and standup-style direct address at one point when Allen interacts with the audience with tipples of gin in warmly comic tones. He has inner demons, spoken of in armchair sessions with a therapist who features as a disembodied voice. But there is also an actual, singing, demonic figure (Mya Fox-Scott) who, we are told, made a pact with his father.…