Seeking in-depth coverage of this French defense sideline [FEN ""]
    1. e4 e6 2. d4 d5 3. Nc3 Nc6


I am seeking high-level, in-depth coverage of the above line.

I was able to find small coverage in ECO C and liked what I saw there.

Is there any book/article that thoroughly deals with this line?

I would give more info, but I am not a French player. Still, I find the line very fun, hence the question.
There's a 12-page chapter on this position in Cristoph Wisneski's "Play 1...Nc6!: A complete chess opening repertoire for Black."  In that book it's reached via 1.e4 Nc6, 2.d4 d5, 3.Nc3 e6.  More generally you're probably more likely to see this discussed in books on the Nimzowitsch defense (with d5, not e5) rather than French defense books.