How can you solve a murder before it's happened?

'This is my challenge for you,' the woman in white said. 'I want you to solve my murder.'

London, 1930s: Rachel Savernake is attending renowned artist Damaris Gethin's latest exhibition, featuring live models who pose as famous killers. But that's just the warm-up act...

Unsure why she was invited, Rachel is soon cornered by the artist who asks her a haunting favour: she wants Rachel to solve her murder. Damaris then takes to the stage set with a guillotine, the lights go out - and Damaris executes herself.

Why would Damaris take her own life? And, if she died by her own hand, what did she mean by 'solve my murder'?

There are many questions to answer, and the clues are there for those daring enough to solve them...