Harry Potter and the deathly Hallows is the seventh and final installment of the Harry Potter franchise. The writer attempts an action-packed resolution and ties all the loose ends of this magical journey of Harry and his friends. The death of Dumbledore leaves Harry with myriads of unanswered questions and mysteries. While all the eyes of the wizarding world are set on him, Harry has some tasks to finish on Dumbledore's bidding and nobody but Ron and Hermione must be privy to it. The trio begins their quest for things which are crucial to weaken He-who-must-not-be-named and reduce him to just his name, Voldemort.
The book also questions the all-knowing, infallible character of Dumbledore. His character arc makes us understand that all of us have dark patches in our past;what we learn from them and what we choose to do in our future is all that matters.
We see Ron going off course for a few chapters only to make a valiant comeback in the nick of time. Neville has shed his timidity and takes up a daredevil avatar, and literally proves himself to be a true Gryffindor.
Molly Weasley has always been seen in the role of an efficient homemaker and strict mother, but you will see her performing top-notch spells to best one of Voldemort's ardent followers.
To conclude, I would say that The Deathly Hallows would leave you asking for more, yet Rowling unfortunately has decided to call it an end, perhaps that's what makes Harry Potter complete and wholesome.