Fells took the sheet of quarto paper under the lamp and decoded the message, writing in the blank space under the typing. It read:
A woman operative "Z" has had an accident. Her address is No. 3, Thurles Court—just off Millard Street, Lower Regent Street. There is no caretaker in the house and her flat is on the first floor. There is no other flat on that floor. On receipt of this message go to Ferrins Garage, Great Smith Street, and ask for Vane. He will know who you are. He will have an ambulance, a nursing sister and an attendant's uniform for you. Vane will drive the ambulance. Both he and the nursing sister work for me. If by any chance there should be any query you are an ambulance-attendant by the name of Green removing a special case for observation at the Middlesex Hospital. When
