Frybabe, I'll be interested to hear what you think of Guardian. My copy is a UK paperback I bought some time ago; I'm not sure if it's out in paperback here or not. The next book is due to come out in May, and judging from the cover shown in Fantastic Fiction, Geary makes it to Earth. It's frustrating to wait for paperbacks, but if I don't, I'll go broke and run out of space. Our library system is quirky about sci-fi--some plusses and minuses, but Campbell is one of the minuses.
The only McDevitt I've read is Polaris, and indeed, I read it straight through.
More elective reading will have to wait, as I have to keep on with Wives and Daughters for the book discussion, read two books for the Feb f2f sci-fi and fantasy book club, then reread Moby-Dick in preparation for seeing the opera at the end of Feb.