The Ministry of Unladylike Warfare

After her adventure in Mongolia, in The Secret of Saynshand, Li Bic is sent to a country house in England to train as a secret agent for the British Empire.
Her first solo assignment is to Manchester's Chinatown, where she must discover whether there really is a Chinese plot to take over the Empire.
What she finds there, apart from great dim sum and terrible English tea, is rather different to what her English superiors had imagined.