He pulled open the next door, both of them hardly daring to look at what came next - but there was nothing very frightening in here, just a table with seven differently shaped bottles standing on it in a line.

"Snape's," said Harry. "What do we have to do?"

They stepped over the threshold, and immediately a fire sprang up behind them in the doorway. It wasn't ordinary fire either; it was purple. At the same instant, black flames shot up in the doorway leading onward. They were trapped.

"Look!" Hermione seized a roll of paper lying next to the bottles. Harry looked over her shoulder to read it:

Danger lies before you, while safety lies behind, Two of us will help you, which ever you would find, One among us seven will let you move ahead, Another will transport the drinker back instead, Two among our number hold only nettle wine, Three of us are killers, waiting bidden in line. Choose, unless you wish to stay here forevermore, To help you in your choice, we give you these clues four: