Sophie and Lil are on their very first case for the Secret Service Bureau in this thrilling adventure. They travel to the seaside town of Rye where – despite its sleepy appearance – they have evidence that a band of German spies are plotting dastardly deeds. Can our two brave detectives navigate smugglers tunnels, make it through treacherous sea mists and decode a secret message to solve the mystery? 

‘A wonderful book, with a glorious heroine and a true spirit of adventure’ Katherine Rundell, award-winning author of Impossible Creatures on The Clockwork Sparrow

'Dastardliness on a big scale is uncovered in this well-plotted, evocative novel' The Sunday Times

'It's a dashing plot, an atmospheric setting and an extensive and imaginative cast. Katherine Woodfine handles it all with aplomb' The Guardian