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With Sophie still missing in action after their explosive mission in Paris, Lil decides to take matters into her own hands. On a new mission for the Secret Service Bureau, can Lil find Sophie in misty, mysterious St Petersburg?
Can they uncover the identity of their true enemy and can they trust anyone – even the Bureau?
It’s time for Sophie and Lil to put their spy skills to the test.
Read the Sinclair’s Mysteries series by Katherine Woodfine: