Chapter 12 Summary

Ron and Hermione do not speak to each other for the remainder of the holiday break and Harry is glad when classes start again. Harry and Lupin set a date for anti-Dementor lessons and they meet on a Thursday evening.

Professor Lupin enters their first meeting carrying a large case. Inside is a Boggart that they will use for practice. He tells Harry that what he is going to teach him is very advanced magic. He will learn the Patronus Charm; which conjures up a Patronus or guardian that shields the caster from Dementors. Each Patronus is unique to the wizard who conjures it. He warns Harry not get discouraged if he cannot get it for a while.

He tells Harry he must think of his most happy memory, hold it in his mind and then utter the charm "Expecto patronum!." Lupin then...