In the thick musty air of the Old Vic Tunnels, the Without Warning cast, led by choreographer Lizzi Kew-Ross, delivered a haunting exploration of the writer Brian Keenan’s more than four years in captivity, with a cacophony of sound, light and movement. Keenan’s story, documented in his book An Evil Cradling (1991), reflects on the years he spent kept in captivity by Islamic fundamentalists.