The USMLE Step 3 examination is a large stepping stone that one must pass in the long journey to become a knowledgeable and capable physician. The majority of questions are based on a clinical story that is presented and aims to test one's ability to perform critical thinking and to predict the next step in management and treatment. And so with this in mind, we have embarked on this mission to find a way to document and present this complex information in a manner that would be most beneficial for our students. We hope that as you read these books you will not only be able to memorize and relearn a bunch of clinical facts, but also to apply this information in clinical scenarios that we have written in the Qbook. Written by three physicians currently in residency, this text is highly clinically relevant as a variety of cases are actual patient scenarios experienced by the authors themselves. Please enjoy!