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"We're two northerners singing about true crime, we really didn't think it would make it to the West End," says Bronté Barbé who plays Stella.

The characters of Kathy and Stella "haven't found their way in life and don't really fit in," according to Barbé.

"And it all unravels from there," Barbé says laughing.

"I think people are fascinated by the psychology of a criminal mind and trying to understand how someone turns into a monster," says Barbé.

"And it means we pass the Bechdel test," adds Barbé laughing.