Book recommendations

hello everyone, i’m new to this subreddit but not to star wars

i wanna learn more about darth sidious when he was a young apprentice and his assassination of plagueis

i’m also interested in learning about nihilus

if anyone has any book recommendations that are about/related to sidious when he was an apprentice, plagueis, or nihilus (or just the time period of when nihilus was alive) that would be much appreciated!

thank you and May the 4th be with you!