sharp and fizzy.\' GuardianHotel\'That unusual theatrical thing, a thriller - and a thriller That really scares.\' Observer\'Stenham achieves the dramatic gearshift between nervous laughter to jolting horror with great panache, and her play keeps springing surprises to the bitter end .. sharp and fizzy.\' GuardianHotel\'That unusual theatrical thing, a thriller - and a thriller That really scares.\' Observer\'Stenham achieves the dramatic gearshift between nervous laughter to jolting horror with great panache, and her play keeps springing surprises to the bitter end .