London, 1930s: Rachel Savernake has been invited to a private view of an art exhibition at a fashionable gallery. The artist, Damaris Gethin, known as ‘the Queen of Surrealism’, is debuting a show featuring live models pretending to be waxworks of famous killers. Before her welcoming speech, Damaris asks a haunting favour of the amateur sleuth: she wants Rachel to solve her murder. As Damaris takes to a stage set with a guillotine, the lights go out. There is a cry and the blade falls. Damaris has executed herself. It is now left to Rachel to question why Damaris would take her own life – and just what she meant by ‘solve my murder’.