“We ask you to keep the secret of 'whodunit' locked in your hearts.”

Those were the parting words to the audience at the New Theatre on Tuesday night after the murderer was revealed, so hopefully this review will not contain too many clues as to who the killer could be.

Without giving away the plot however, the first ever UK tour of Agatha Christie’s ‘The Mousetrap’ was a success in Cardiff.

From two nuns enjoying ice-creams in the upper circle to a pair of rocker twenty-somethings in the stalls, the audience seemed hooked.

And from overheard theories in the interval, plenty of people were in suspense regards the culprit with few guessing the correct character.

The scene was set when a group gathered in a country house cut off by the snow discovered there was a murderer in their midst. One by one the characters revealed their pasts until the identity and the motive were finally revealed.

The play was true to the original and showed its vintage with references to the wireless license and not bringing the hoover through the front parlour.

For the longest running show of any kind in the history of theatre, with over 25,000 performances, it’s understandable that the director has not changed much.

The set remained the same throughout, although the backdrop changed to evocative effect as a blizzard howled outside. When the shutters were thrown open, many in the audience shivered as though the cold wind had literally entered the theatre.

The play may not be for those seeking horror, as the suspense was on a low boil rather than anything likely to cause nightmares.

It was a compelling, charming and funny show which you could take your mum to and be confident she would laugh as much as you.

The Mousetrap runs at the New Theatre until Saturday.