Crisis On Infinite Earths
This Earths-shattering event takes place in the cracks in the Multiverse between pages 143 and 160 of Infinite Crisis, as Superman battles Superman. Superman: Infinite Crisis looks at the lives of two Supermen as they may have played out had their roles been reversed. Light in a battle that ultimately pits the Emerald Archer against the deadly Merlin.
As the Crisis mounts, Green Arrow joins with Black Lightning to face Dr. Heading into the Light opens as Oliver Queen, Connor Hawk, and Mia discover that their home has been destroyed, which begs the question: How did anyone know that it was their home. Those last pages reprint material from Infinite Crisis, which is best read alongside Infinite Crisis itself. These Superboy battles take place concurrently with Infinite Crisis, pages 115-208. The door between life and death has been creeking open ever since the return of Superman after his battle with Doomsday. Much of its story seems to take place absolutely prior to Infinite Crisis, because no references are made to anything that is going on in IC up until the end of Chapter 5, which parallels page 108 of Infinite Crisis. This book presents a bit of a conundrum.
There is no chronology between Crisis Intervention and World Without a Justice Leage, but this book definitely takes place prior to Heading Into the Light, below. This book also takes place after the Day of Vengeance finale and should therefore be read after page 44 of Infinite Crisis Companion. Batman has dissolved the Justice League of America, but with the impending Crisis, heroes still need to band together to battle countless foes, including the embodiment of Envy itself. Their appearance here seems to place this part of the story at least after page 44 of the Infinite Crisis Companion and prior to page 108 of Infinite Crisis.
There's nothing really Crisis-related going on until page 75 when we get a visit from some OMACs and the Shadowpact. The first have of this book takes place prior to the start of Infinite Crisis and is mostly about Robin joining up with a military group. This book takes place just after the Day of Vengeance Special, which ends on page 44 of the Infinite Crisis Companion. Also, Donna Troy recruits half the team, along with other heroes, for an important mission in space, while the rest must contend with the Society. The rest of the story takes place One Year Later and actually does have some rather interesting pre-Crisis ties, so it is definitely worth reading within in the scheme of this whole story, just don't read it until after you've finished up with the rest of IC. Anywhere inbetween 84 and 101 would be perfectly fine.
Just be sure to read this before page 101 of Infinite Crisis. The first chapter of Ghost Stories is an exploration of that gift. Power Girl receives a gift on page 84 of Infinite Crisis. I struggled with the inclusion of Ghost Stories, because only the very first issue contained in this collection actually takes place during Infinite Crisis, but it is a very important part of the story, at least for a couple of the characters, so here you have it. Unfortunately, there are no page numbers, so get ready for some confusing instructions. The second half takes place during the pages of Infinite Crisis itself. However, it also expands upon the ramifications of these events within Wonder Woman's life and the lives of all of the Amazons of Themiscyra.