Only two (classic) adventure games? These were so well written, and beautiful to look at. What a shame they didn't get more games out.

There were plans to make a third game, called "The Secret of Vulcan Fury".

IIRC there was apparently a third one planned but didn't get made for some reason.

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EDIT

Lol, I see Fredde beat me to the punch while I was typing my reply.

Point and click adventure games in general slowly died out around that era. A real shame :(

Yeah, that game apparently had all the voice work done for it already and may have been pretty far in development before it was dropped and vanished forever.

Really wish all the work done on it was released to the public in some way. It was the last project to use Kelley's voice as "Bones" before he passed away.

Hate to say it, but from what I recall Secret of Vulcan Fury would have more been like a Myst style adventure than like 25th Anniversary and Judgment Rites.
The cutscenes looked really amazing though, really in the style of the old series.