Sixth-year Hogwarts student Harry Potter gains valuable insights into the boy Voldemort once was, even as his own world is transformed by maturing friendships, schoolwork assistance from an unexpected source, and devastating losses.

Sequel to: Harry Potter and the Order of the Phoenix. Sequel: Harry Potter and the deathly hallows.

The other minister -- Spinner's end -- Will and won't -- Horace Slughorn -- An excess of phlegm -- Draco's detour -- The slug club -- Snape victorious -- The Half-Blood Prince -- The house of gaunt -- Hermione's helping hand -- Silver and opals -- The secret riddle -- Felix Felicis -- The unbreakable vow -- A very frosty Christmas -- A sluggish memory -- Birthday surprises -- Elf tails -- Lord Voldemort's request -- The unknownable room -- After the burial -- Horcruxes -- Sectumsempra -- The seer overheard -- The cave -- The lightning-struck tower -- Flight of the prince -- The Phoenix lament -- The white tomb.