All The Warlock's Men

Tom Riddle was born in 1977, graduating from Hogwarts only shortly before Hermione Granger. When a bizarre break-in at the Wizengamot leads them both to investigate a story for the Prophet, a vast network of corruption is uncovered, threatening to topple the Ministry itself. [Based on the Woodward & Bernstein novel detailing the Washington Post's investigation into Watergate.]