Cross-breed the Addams Family with Lonnie Donegan, exile the offspring to rural Australia for 50 years, and you would end up with the Kransky Sisters. These three musical spinsters recreate tunes they have heard on the radio while trying to keep dysfunctional childhood memories and seething sexual repression at bay. Their act is appealingly idiosyncratic rather than laugh-out-loud funny, and is impressively realised by its kohl-eyed and bloodless cast.
The sisters take a while to divulge their secrets. We do not immediately know why matriarchal Mourne and submissive Eve resent sheepish half-sister Dawn. They dispatch a Michael Jackson medley on reed organ, toilet brush and musical saw before we hear about their upbringing - when the infant Eve was found with her lips to a cow's teat, "you got the wooden spoon, didn't you, and the cheese grater down the back of the ankles?" Given those horrors, they have done well to prosper as touring songsters obsessed with burying the roadkill they encounter while traversing the outback.
The show is full of such twisted eccentricity, but not much comic heat. There is humour, certainly, in the disjunction between their tunes (Born to be Wild, Eurythmics' Sweet Dreams) and their sepulchral personalities. But, while Mourne's voice plumbs amusingly ghoulish depths and there is eye-catching business with two ribboned tambourines, other people's songs give us limited insight into the Kranskys' world. The harmony singing is gorgeous, and so is Eve's stoppered-volcano response to a kiss from a man in the audience. But finally, the show offers only a tantalising wooden spoon's worth of Kransky, rather than the full cheese grater to the ankles.
· Until Saturday. Box office: 0845 120 7550.