I have just finished reading this book.
It is an informative and well-written narrative of the Second World War between August 1941 and September 1942 as it might have turned out if two German plans had been adopted: the drive on Moscow and the capture of Malta.
Towards the end of the book there is a fleeting reference to developments later in the war, but I found that I was left at the rather sudden finale hoping for a sequel. It appears to be well researched as to available forces and military options, and the decisions made by key historical people are apparently in line with their known views and historical actions.
I thoroughly enjoyed it, and it has given me inspiration for (yet another) project already in the pipeline!
General Whiskers' semi-historical wanderings 
I love the idea of Malta campaign. Does the book deal with Operation Herkules or the OKW’s idea of attacking Malta before Crete? Herkules is an interesting read and I have found some resources I can send your way. Despite the plan by Student, it seems the Fallschirmjager didn’t adopt a lot of the lessons. During Op Stosser (Dec ’44) they jumped without their weapons, AGAIN, despite the Malta plan identifying that as an issue.
The author devotes a chapter to the invasion and fall of Malta in April 1942. It is concurrent with Rommel taking Egypt. Lessons (on both sides) had been learned since Crete the previous year.