Tim Pickles' compact account of the 1565 Great Siege of Malta, when a few thousand Knights of St. John and Maltese defenders held off an Ottoman invasion force of over 30,000 for nearly four months. The book is part of Osprey's Campaign series, so expect clear maps, battle diagrams, and concise military analysis rather than literary prose.
Read it before visiting Fort St. Elmo in Valletta or the fortifications at Birgu -- the siege will come alive when you stand on the ramparts where the fighting actually happened.