Conversation so far:
Was Lord Voldemort in the film Harry Potter and the Half-Blood Prince?
Lord Voldemort does not appear in Harry Potter and the Half-Blood Prince.
How was Lord Voldemort's presence felt in Harry Potter and the Half-Blood Prince?
Lord Voldemort presence and actions are felt when he once again declares war, and begins to rise to power once more.
What happens as Lord Voldemort gains power in Harry Potter and the Half-Blood Prince?
Lord Voldemort murders Amelia Bones of the Department of Magical Law Enforcement, and begins to target members of the Order of the Phoenix, including Emmeline Vance.
What happens next in Harry Potter and the Half-Blood Prince after Voldemort murders Amelia Bones and targets members of the Order of the Phoenix?
J. K. Rowling uses several chapters in Harry Potter and the Half-Blood Prince as exposition to establish Voldemort's backstory.
How does J. K. Rowling establish Lord Voldemort's backstory in Harry Potter and the Half-Blood Prince?
J. K. Rowling establishes Lord Voldemort's backstory in a series of flashbacks, using the pensieve as a plot device.
Who was Lord Voldemort son of?
J. K. Rowling reveals that Lord Voldemort was the son of the witch Merope Gaunt and a Muggle called Tom Riddle.
What happened after the discovery of the identity of Lord Voldemort's parents?
After living in an orphanage, young Tom Marvolo Riddle met Dumbledore, who told him he was a wizard and arranged for him to attend Hogwarts.
What happens after Tom Marvolo Riddle get into Hogwarts?
Tom Marvolo Riddle was outwardly a model student, but was in reality a psychopath who took sadistic pleasure in using his powers to harm and control people.
Was Tom Marvolo Riddle good or bad while attending Hogwarts?
Tom Marvolo Riddle was, in reality, a psychopath who took sadistic pleasure in using his powers to harm and control people.
What does Tom Marvolo Riddle go on to do after studying at Hogwarts?
Tom Marvolo Riddle eventually murdered his father and grandparents as revenge for abandoning him.

Question: What happens next after those bad things?
Self-contained rewrite: What happens after Lord Voldemort harms and controls people and kills his father and grandparents?