Professor Severus Snape, Potions master and double agent, was worried. He had been teaching a remedial Potions lesson (as if it wasn't irritating enough) when a Patronus (incorporeal, so it was hard to tell who it was) said, "Chamber- ASAP! Operation Goblet is go!" Professor Snape was debating whether to trust the message, but then he recognized the voice. Sirius Black! Padfoot was a member of the order, and even though they were enemies in their school days, they [reluctantly] made up. He decided to trust it. After all, he did mention the Goblet, and only Order members knew, right?
Wrong. Sirius was there, but so was-wait, what?!-Ghost City members, who had made it successfully into the afterlife, which was here! Ghosts swooped down, tickling them.
As they trekked further along, they found a blue light. Knowing this was the Goblet, they followed it. The ghosts, however, had other ideas and pulled them back. Though they were dead, they were fierce fighters, but the ex-enemies got through. The Goblet of Fire was spewing out names like crazy. Slightly intimidated, they took a U-turn the way the ghosts said to go.