Stand-up comedian Jason Manford headlines with the lead role of Lieutenant Frank Cioffi, an amateur dramatic buff who is called in to investigate a murder in a theatre.
He's in his element trying to crack the case as well as fix the troubled musical, being reworked after appalling first-night reviews.
As you can tell, it's an unbelievable storyline but this isn't a show that takes itself too seriously, despite having songs written by Kander and Ebb, who were behind hit musicals like Cabaret and Chicago.
There's gentle comedy throughout but it's Samuel Holmes as the sarcastic director Christopher Belling that stands out as the funniest on stage and, interestingly, not Manford.
Manford's role involves the TV comic playing it much more straight than audiences will have seen him before. Plus he has big song and dance routines with his love interest Niki, played by Leah West.
He does it all well but there's a stark comparison of singing voice and dancing between him and seasoned stage professionals like West as well as former Hollyoaks star Carley Stenson and the hugely impressive Rebecca Lock as the producer of the show Carmen Bernstein.
Jason Manford isn't the funniest person in Curtains
It still works though as Manford's charm as the investigating police office builds up a rapport with the audience.
Those expecting a suspenseful murder mystery will be left disappointed by Act One but stick with it as the second act picks up the pace and has more intrigue and deaths. There's red herrings and a decent big reveal too.
Mixing so many genres together in one show isn't ideal as it dilutes the focus of the plot. That said, strong performances help make this an enjoyable enough musical... Or should that be comedy/who-dunnit.