New for 2025, an exciting mystery adventure story for readers aged 9-12 from the bestselling Sinclair’s Mysteries!

It's time for a marvellous mini adventure with secret agents Miss Sophie Taylor and Miss Lillian Rose!

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?

Praise for The Sinclair’s Mysteries series:

‘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