My IR 101 textbooks were:
The Globalization of World Politics: An Introduction to International Relations by John Baylis, Steve Smith and Patricia Owens
Understanding International Relations by Chris Brown and Kirsten Ainley
Theories of International Relations by Scott Burchill, Andrew Linklater, Richard Devetak and Jack Donnelly
Not sure exactly what you are looking for but maybe that helps. If you have a particular interest/knowledge of an area of IR then you might be better of getting a book or two on that