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Sherlock and John waited until nightfall to begin searching Azkaban. While they waited, John began to nod off. He mumbled something as he started to doze off. Sherlock nudged him awake. “John! It's time!” he said in a harsh whisper. John jolted up. He walked over to the bars to see if their was anyone or anything wandering the halls.
Mycroft and Lestrade managed to sneak in Sherlock's Invisibility Cloak, a map, and the boys' wands into their cell. And Sherlock managed to work some magic on the bars so no potential alarms would go off. “Coast clear?” Sherlock whispered from under the recently-donned Invisibility Cloak. “Yep.” John whispered back. He drew his wand, “Alohomora.” He whispered, unlocking the cell.
Sherlock threw the cloak over John. They were ready to search the prison. “Lumos.” John whispered. He pulled open Mycroft's map, which had all the most possible locations of The Chest marked on it. Apparently, they had nine locations to search, and only five hours until daylight.
They searched and searched. Eight locations and four hours later, and still no chest. And from the looks of the last spot (which was colder then the other places), the ninth place didn't have it either. “Oh, come on!” Sherlock bellowed, ripping the cloak off in frustration. “Does The Chest even exist? I know Smith is mad, what with his severe D.I.D., but...”
“Sherlock,” John interrupted, the color drained from his face. “Does the map happen to say, I don't know, “Don't bother with here, it's dangerous, let Lestrade and his division handle this?" ” Sherlock looked closer at the map. “Well, yes. Yes it does. I almost forgot how atrocious Mycroft's handwriting is. I swear, it's like he writes in CAPTCHA...” He turned to John, “Why?” John pointed up at a horde of black-cloaked creatures, trying not to tremble. “That's why!”
Sherlock felt unnerved. “John, care to tell me what those things are?” John backed up to the wall, taking Sherlock alongside him. “Dementors. They feed off human happiness, sucking it out of you and leaving depression. And they can suck out your soul, leaving you an empty shell.” Sherlock was about to ask how to defeat them, when a Dementor started to suck the happiness right out of him.
“SHERLOCK!” John shouted, not caring about secrecy anymore. He pointed his wand at the Dementor, desperate to save his friend. “EXPECTO PATRONUM!” A silvery German Shepard appeared and fended off some of the Dementors, including the one attacking Sherlock.
Sherlock gasped and started to loose his balence. John grabbed him. Once he was steady, Sherlock finally spoke. “I felt so cold... John, that... that thing you did... Wha... What was that?”
“A Patronus. You see, you think of a powerful, happy memory, and it fends off Dementors. Luckily I managed to get one with a form, huh?”
Sherlock nodded, “Thanks.”
Suddenly John's Patronus disappeared. The Dementors started closing in again, this time they closed in on John. “EXPECTO PATRONUM!” Sherlock shouted, hoping it would work for him, too. Sure enough, a silver Jack Russel form flew around, chasing the Dementors.
John chuckled, steadying himself. “We seem to have plenty of dumb luck today.” Sherlock started to chuckle, too. Then the new Patronus wore off, too. “And now it appears we're out of dumb luck...” Sherlock quipped. The two boys prepared to summon more Patronuses, ready to fend them off all night if necessary...
...When another, stronger Patronus appeared in the shape of a wolf. It fended off the Dementors as the two were suddenly pulled out of the room. As soon as they were safely away, Lestrade pulled off his Invisibility Cloak, and removed an odd pair of goggles from his head
“Didn't Mycroft tell you boys not to go in there?” he scolded. “Since when has he ever listened to him?” John replied. Sherlock pointed at the Cloak. “He can't trust me for a minute, can he?” Sherlock added. Lestrade folded his arms. “Apparently not. And I'd already checked there after dropping you off. You two risked loosing your souls for nothing.”
Lestrade sighed and placed his hands on the two boys' shoulders. “Come on. Let's get you two back to Hogwarts. And get you two some chocolate, to remedy the effects of this fiasco.”
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