I never was a fan of derivations but I was surprised that I enjoyed this book. It doesn't read like a book adaptation and hardly filled with info-dumps which you'd expected from a rich Mass Effect verse filled with diverse creatures and technology. I think I read this book too quickly. 
 Mass Effect: Revelation was set around twenty years before the events in Mass Effect. It was the story of Lieutenant David Anderson and the short time where he became a Spectre-candidate and the beginning of several events that eventually leads to Saren's unfortunate discovery. The story focus itself around the events around the destruction of Sidon Research Facility and the cat and mouse chase to find the sole survivor of the attack, Kahlee Sanders. 
 It was an easy book to read although I simply glance through excessive descriptions of fight scenes but I enjoy several details about Skyllian Verge, the politics of the Council and the fight for humanity right in galactic politics and expansion and also the problems related to humanity presence in the known galaxy. In a way, the book was an introductory attempt to the Mass Effect universe without being overwhelmed by the lore.