I know the basic principles of the war but forgot most and I want to get my hands on some really interesting literature that is enjoyable/yet informative on the war. What do you suggest?
MacArthur's War by William B. Breuer. It focuses on the formation and operations of the OSS (precursor to the CIA) throughout the Pacific Theater. It's incredibly interesting and brings to light a side of the war often overlooked or forgotten.
AJP Taylor's Origins of the Second World War was a ground-breaking work of historiography and I loved it when I first encountered it. It is dense, but very readable.
He came under a lot of flak when it was first published in 1961, but he was the first historian to consider WWII in terms of realpolitik, instead of the "Hitler was mad and the Nazis were evil" perspective which had dominated accounts of the war in the years preceding his account.
The Rise and Fall of the Third Reich by William Shirer. Shirer lived in Germany during the Third Reich and is able To produce a first hand account of the general attitude towards Hitler before, during and after his reign.