Righto. Plot so far:
-993.M41 The Coriolis Alpha system is interdicted by order of Inquisitors Gelert Hesh and Fabian Filipowski, among others, after a bloody civil war in which two billion people -- half of the population -- perished. Rumours point to a concurrent Dark Eldar invasion lighting the proverbial powder keg among the population, but this proves impossible to verify.
-008.M42 A vid-recording is received in which Inquisitor Rowena Memphis renounces her faith in the Emperor. The time stamp on the recording lines up with events at Coriolis Alpha and Memphis is denounced as a heretic and declared a traitor to the Imperium.
-009.M42 Memphis is captured by the Inquisition. Hesh learns that she was at Coriolis Alpha when events there took place. Ambrose Barkley signs the petition to have her executed.
-010.M42 Kalen Goruvich of the World Eaters binds the Bloodletter Agares.
-012.M42:
-Inquisitors Madoc Haines, Riley Hallona, Desmond Holst, and Anterus Semplice receive odd messages from Coriolis Alpha, and independently gain permission from the sector Conclave to investigate.
-Barkley similarly seeks permission to conduct a separate investigation.
-During negotiations, Zagan of the World Eaters exits the Warp and uses a techno-sorcerous device to enslave the ships of the interdiction fleet. The Asculum, the flagship of the interdiction fleet, is destroyed in the ensuing battle.
-Sonneillon of the Word Bearers sabotages the Chartist vessel Demeter, forcing it to exit the Warp in the middle of the space battle. The cruiser Archduke Gordian is enslaved and set on a collision course with the Demeter.
-Life pods from stricken capital ships and the Demeter land on Coriolis Alpha III.
...and that's roughly where we're currently at.
Don't sweat it if you're mostly done with the space battle. So are we, and the plot will be marching on shortly -- I'm just waiting for Herald to post something with Barkley.
EDIT: Yes, there was a reason I mentioned Goruvich and Agares

EDIT 2: If that homework is maths homework then being as I'm a trainee maths teacher, I'll help you out
