Taken from the NeoGaf forums. According to user dex3108, former Valve writer Mark Laidlaw posted on his blog the plot to Half-Life 2: Episode 3. Announced almost ten years ago, the sequel has yet to be released, leaving Half-Life 2’s ending without closure. Laidlaw’s blog is currently getting hammered. Although, the text dump can be found here for those of you interested.
I hope this letter finds you well. I can hear your complaint already, “Gertie Fremont, we have not heard from you in ages!” Well, if you care to hear excuses, I have plenty, the greatest of them being I’ve been in other dimensions and whatnot, unable to reach you by the usual means.
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Source: [H]ardOCP – Half-Life 2: Episode 3 Plot Posted By Writer