Included is a list on notepad letting you know which month each book came out from June 2007 to Nov 2008. Based on that it should be easy to figure out the December book order based on book number. It really doesn't matter too much which series you read cause most of them are self contained. None of the individual titles tie in directly with each other and only loosely with the main 8 book series. Example: Secret Invasion X-Men doesn't tie in with X-Factor; New Avengers is totally different from Mighty Avengers; Secret Invasion Spider-man isn't even about Webhead. He's busy in New Avengers which isn't connected to SISM.
