The Princes in the Tower by Alison Weir (1994, Hardcover)

Despite five centuries of investigation by historians, the sinister deaths of the boy king Edward V and his younger brother Richard, Duke of York, remain one of the most fascinating murder mysteries in English history. Did Richard III really kill the young princes, as is commonly believed, or was the murderer someone else entirely? Carefully examining every shred of contemporary evidence as well as the dozens of modern accounts, Weir reconstructs the entire chain of events leading to the double murder to arrive at a conclusion Sherlock Holmes himself could not dispute.