You will have no trouble finding history books in your local library so let me suggest something a little different, some historical fiction. An English writer named Olivia Manning wrote two excellent trilogies that I cannot recommend enough: The Balkan Trilogy and the Levant Trilogy. Manning was a journalist in Romania, Greece and Egypt during the war and wrote these novels based on her experiences. They present a civilian's eye view of the times and gave me a feel for the event that I found really stirring and helpful. She is a marvelous writer.

There are a few good options on the naval campaigns. My biggest recommendation would be The Naval War in the Mediterranean 1940-1943 by Jack Greene and Alessandro Massignani. It's a broad look at the naval war, covering in detail the drivers of naval tension in the 1930s, and then the war itself. It uses Italian sources that have been somewhat ignored by English-speaking authors, resulting in a comprehensive work that covers all aspects of the war well. Bernard Ireland's The War in the Mediterranean 1940-1943 is a similar work in scope. Focused more on British sources, it is probably also more accessible to the casual reader. For books focused on particular battles, my key recommendations would be David Wragg's Swordfish: The Story of the Taranto Raid, and Antony Beevor's Crete: The Battle and the Resistance. Both are well-written, detailed studies of the battles in question. Wragg's book also covers a number of naval operations before and after Taranto.