Can someone summerize what happens in half life 2?

My laptop crashes when ever I play Half-Life 2 eb 2, So can someone summerize what happens in it for me? Not the ending I mean gernarly.

This is the general plot.

Continuing the plot of Half-Life 2 and Episode One, Episode Two consists of seven chapters telling the story of Gordon Freeman and Alyx Vance's journey to a large Resistance base called White Forest. After the destruction of the Citadel, the Combine are working to open a massive superportal to call for reinforcements.

An integral part of the plot is the transmission packet which the Combine sacrificed the Citadel to send, and which Alyx and Gordon stole a copy of before making their escape. It contains information relating to the location of the Combine homeworld and allows the creation of the superportal to be controlled from the 'other side'.

This information has to be delivered to White Forest so that the Resistance can use it to shut down the superportal and prevent another Combine invasion.

hey, thanks. Now I just want to buy a new laptop and play it