Being a big fan of Star Wars and it's large gallery of colourful Sith lords, I very much enjoy reading the various novels with certain Sith lords being the focus of those novels. Such as the Darth Bane trilogy or any of the Legacy of the Force novels which focus on Darth Caedus.
Personally my favourite book would be the Darth Plagueis novel, excellently written, fleshes out Palpatine hugely and properly introduces the great Hego Damask, also known as Darth Plagueis. The novel also helps to give reason to many of the events during the prequel film trilogy and gives a greater understanding of many characters we get a glimpse of but are never fleshed out enough in the films.
Highly recommend this novel to any fans of Star Wars and especially those interested in Darth Plagueis and Darth Sidious.
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Hee to the ho.