Book 1
Operation Zigzag
Hannah Howe
Book 2
Operation Locksmith
Hannah Howe
Book 3
Operation Broadsword
Hannah Howe
Book 4
Operation Treasure
Hannah Howe
Book 5
Operation Sherlock
Hannah Howe
Book 6
Operation Cameo
Hannah Howe
Book 7
Operation Rose
Hannah Howe
Book 8
Operation Watchmaker
Hannah Howe
Book 9
Operation Overlord
Hannah Howe
Book 10
Operation Jedburgh
Hannah Howe