The main conflict in Harry Potter and the Half-Blood Prince is the constant requirement for both Harry, Dumbledore, and the members of the Order of the Phoenix to vanquish Lord Voldemort and his plans as soon as possible before he becomes too strong or does something very destructive. Minor conflicts include Harry's innate need for him to be right bout his hunch that Malfoy is a Death Eater and Snape cannot be trusted, both of which turn out to be true according to the climax of this book.