First, the question. In the final conversation, between Cassie and Klauser (which really needs extended explanation), Cassie asks Klauser what to take on the trip to Woldercan. He says, "Women have monthly needs. You could use rags, and our great-great-grandmothers did, but if you would prefer not to...". WTF? Who talks like that? Why would an old man tell an old woman about menstruation and the historic ways to deal with it?
Now, Cthulhuiana and spoilers (if I'm lucky). The two major male protagonists have multiple identities (Wallace Rosenquist/William Reis and Gideon Chase/Gil Corby) but the names keep the same initials. If someone can have two identities, they can have more. Since it's a Lovecraftian book, let's look there.
The first one is easy. Gideon Chase is the Great Cthulhu.
The second one is tougher. I can't be sure, but I'll go in order of descending likelihood. I would like to thank my copy of Encyclopedia Cthulhiana, which comes in handy more often than you'd think.
1. "Black Ram with a Thousand Young". The male aspect of the Outer God Shub-Niggurath. My favorite for plot purposes.
2. "Wza-y'ei Rhan-Tegoth" The first word is the start of the chant that summons Rhan-Tegoth, a Great Old One who came to Earth. It is said that the destruction of Rhan-Tegoth would prevent the awakening of the Great Old Ones.
3. "Watery R'lyeh". Cthulhu's underwater city.
4. "Beyond Rigel". Rigel is a star that is associated with the Elder Gods, enemies (more or less) of the Great Old Ones.
I like 1 best because it turns the whole story into infighting between the bad guys with Shub-Niggurath getting the U. S. Navy to nuke Cthulhu. Cassie is just a pawn in this game and is going to get her just "reward" on Woldercan from the Great C himself.
Enamel