In this book, Harry Potter learns a lot about Lord Voldemort's past, and Harry Potter prepares for the final battle against his nemesis with the help of Headmaster Dumbledore. But in that time, Voldemort returns to power, and makes a plan to destroy Harry. So, Harry Potter tries to destroy Voldemort first, but for that, Harry must collect all parts of his soul. Voldemort had split his soul into pieces, so that he would never be totally destroyed, and now Harry has to destroy all the pieces, so Harry sets out with Dumbledore to find the Horcruxes.
At a memorable moment, near the beginning, Hermione gets very angry at Harry because he starts doing very good in the potions class. Harry starts doing so well after he finds the “Advanced Potion-Making” book that was filled with quicker ways to make potions. It was personally improved by Professor Snape, and then nicknamed the “Half Blood Prince”.
This novel can definitely petrify you as well, like in one part, Harry and Dumbledore go out to find the 1st Horcrux, where Dumbledore is forced to drink the Drink of Despair, which is a mysterious potion that makes a wizard very vulnerable and weak. So, this potion is meant for protecting something very important.
With Harry constantly chasing after Horcruxes, this book keeps a good pace, so I'm going to go with 3/5 stars for Harry Potter & The Half-Blood Prince.