Enter The Saint
A set of 3 interconnected novellas:
1) The Man Who Was Clever - working with a small group of people, the Saint brings down a drug smuggler.
2) The Policeman With Wings - Simon Templar and his friend Roger look into two kidnappings connected to stolen diamonds.
3) The Lawless Lady - A friend of Simon, Dicky, infiltrates a gang only to fall in love with its female leader.