Check out AACN Essentials for Critical Care Nursing
Bought it on Ebay and I am super glad I made the purchase. The first 200 pages are dedicated to new grads/new icu nurses regardless of specialty. Talks about assessment, ventilators, hemodynamics, etc.
Another book I bought to bring with me to work is Quick Reference for Critical Care. Have had awesome reviews, and I can tell the book is going to be a great resource. Also purchased on Ebay. Got both books for $100 brand new.
Although I haven't started my new job yet, I have been looking over the AACN for a leg up on the basics of critical care.. I plan to bring the Quick Reference with me to work, as it goes by system, as well as has a section on tests/medications. I can give a more detailed update of how they helped after starting on the floor.
Best of luck with your career in the Neuro ICU.