"Professor, we swear it is Bellatrix. We found the evidence!" Sirius said but Dumbledore just smiled.

"Sir Cadogan was confused, so I'm afraid he's no reference."

"Then interrogate her. Use Veritaserum. She'll confess, I'm sure."

"Mr. Filch," Dumbledore said, and the man who was still holding James and Sirius by their scruff looked up, "Would you be so kind to ask Miss. Bellatrix Black to come to my office?"

Filch nodded and exited the room.

"Mr. Black and Mr. Potter, you may go now."

"But professor, I want to testify!" Sirius said, but Dumbledore nearly pushed them out of his office.

Once outside, they set off for the Gryffindor Tower, since there was nothing else to do.

"Sirius?" James began, and Sirius looked up. "Even if she doesn't get caught now, I think we can be sure that one day she'll see Azkaban. Especially when we become Aurors."

"I hope so," Sirius said smiling. "Family feasts would become much nicer suddenly."

And laughing, they gave the password to the Fat Lady.

"So she had to see the Headmaster? And you don't even know for sure she's done it?" Remus asked in disbelief.

"Incorrect. We do know it was her!" said Sirius.

"What makes you so sure?"

"Deduction," James simply said.

"De– what?" Peter asked.

"Never mind," Sirius said.

Only then, they heard a ticking noise near the window. An owl was tapping it with its beak and Remus stood up to open the window. If flew in and landed on James' bed.

"Hey there, get off!" James grumbled, before he untied the note the owl carried. "Sirius, it's addressed to us."

Sirius walked over to him curiously. "Let me see."

To Messrs. James Potter and Sirius Black.

I would like to inform you that Miss. Bellatrix Black has indeed confessed the poisoning of the students. Although your methods are highly questionable, you are each rewarded twenty house points for finding the culprit.

Regards.

Albus Percival Wulfric Brian Dumbledore

Sirius and James cheered, and started dancing through the dormitory.

"We did it! We solved it! High five, Jamie!"

"Well done, co-investigator! Congratulations to both of us!"

"Now we only have to find out how Bellatrix cursed Sir Cadogan."

"Oh, no, not again!" Peter wailed and he threw his hands up in the air. "Merlin, please save us!"

"No need to make an investigation out of that," Remus said and the two immature boys stopped their antics to look at him.

"What do you mean, Mr. Lupin?"

"I mean to say that I was the one who cursed all the portraits on the first floor to act out of character as a prank," he answered with a grin that was almost identical to the two devilish grins on his friends' faces.

"You got away unnoticed and Bellatrix is blamed for it. Remy, we love you!" said James.

"And by solving that mystery, the Marauders went down in history," Sirius said, before three pillows were thrown at his head.

And that's the end. I hope you liked reading that as much as I liked writing it! :)

If you were wondering, madam Pomfrey healed all the students that were poisoned.

~MysteriousMissSirius