The first half, however, felt somewhat slow. There were moments of tension and plenty of anticipation, but it sometimes seemed to be taking a little too long to reach the point where the scares really began to land. The build-up was certainly deliberate, but I found myself waiting for the production to deliver more.

The second half was a completely different story though.

Once the action really got going, the tension became almost unbearable. The atmosphere in the theatre changed noticeably, with the audience becoming increasingly quiet as we waited for the next unexpected sound, movement or visual effect. There were some genuinely effective scares, and the live setting made them particularly memorable. Unlike watching a horror film at home, there is no opportunity to pause, look away or turn the lights on — you are completely immersed in what is happening around you and the increased darkness within the auditorium really drops you into the middle of the unease.

One of the most unusual aspects of the evening was an unexpected medical emergency in the audience, which brought the performance to a halt for around 30 minutes. Obviously, this was completely beyond the control of the theatre or cast, and the priority quite rightly had to be the wellbeing of the person involved. The audience remained remarkably patient while the situation was dealt with, and the performance eventually resumed.  We must also mention the performers, James Bye and Hannah Sinclair Robinson who handled the situation very well, having to reimmerse themselves into the dark and unsettling world after a prolonged break.