https://www.polygon.com/2017/8/25/16202006/half-life-2-episode-3-plot-mark-laidlaw-valve

Half-Life writer Marc Laidlaw, who left Valve in 2016, may have just revealed the proposed plot of Half-Life 2: Episode 3 on his personal website. In a post titled “Epistle 3,” Laidlaw presents what appears to be a thinly-veiled summary of Gordon Freeman’s long-missing adventure in the form of correspondence from someone named “Gertrude Fremont.”

“I hope this letter finds you well,” the letter begins. “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. This was the case until eighteen months ago, when I experienced a critical change in my circumstances, and was redeposited on these shores. In the time since, I have been able to think occasionally about how best to describe the intervening years, my years of silence.”