In reply to Philly:
(This will quite possibly be completely useless to you as the guides are in french)
The guides I used when climbing around Grenoble were the ZE Topo "Escalade en Isere" It's split into two volumes with #1 being more focused on the Chartreuse and #2 being more focused on the Vercors and Belledonne. They're great guides but if you have no way to either understand them or translate them, you might struggle to find the Crags.
I'm afraid I can't remember if there were any guides in English when I went shopping for one (the local Decathlon has a good selection of local guides) but it's possible.
In any case good luck, there's some decent climbing around those parts!