The second instalment in the Taylor and Rose Secret Agents series from bestselling children's author Katherine Woodfine.

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.