Takes place in between Signs of Three and the Last Vow. So, to recap, Supernatural: after they get Sam and Cas back, Harry Potter: two years before the epilogue, Avengers: after Thor 2, Sherlock: in between signs of three, and Doctor Who: in between 50th and Christmas Special. That's how it will remain for most of the story.
...
Chapter 53
Sherlock, John and Mary were all chatting in 221B Baker Street.
"You could always name the baby Hamish," Sherlock said, tuning his violin. "If it's a boy."
"Very funny Sherlock," John said sarcastically.
"This is going to be so much fun!" Mary said. "Baby shopping, baby names, a party!"
"It does sound very fun, dear," Mrs. Hudson said, putting down a serving plate with cups of tea on it.
"Thank you, Mrs. Hudson," John said.
"Well," Sherlock said, getting up and moving over to the desk, "I think that…that…" He was looking out the window.
"What it it?" John asked, alert.
Sherlock turned as Lestrade ran in.
"Oh, you're going to like this one," Lestrade said.
...
"So, let me get this straight," John said. "This girl…she's been missing for over a year."
"Yes," Lestrade said, nodding.
"And she just happens to be walking by when the murderer walks out?" he finished.
"Yes," Lestrade said. "But it's even stranger than that. She gets shot, goes to the hospital. And overnight, her wound just vanishes. And get this. When I ask her what she's doing, she asks for Sherlock."
"So, you're saying that there's a mysterious girl who's been missing for over a year in the hospital, that her gunshot wound vanished overnight, and that she's asking for me?" Sherlock asked.
Lestrade nodded.
"Then what are we waiting for?" Sherlock asked.
...
Sherlock, John and Mary joined Lestrade, Donovan, and Anderson (who got his job back) in the hospital.
Lestrade led the way to the room. He opened the door, and Sherlock waltzed in there, cocky. But he froze when he saw who it was.
Everyone else filed into the room after him.
"What, what is it?" asked John, when he saw the look on Sherlock's face.
"YOU!" Sherlock gasped.
"Hello, Sherlock," she said. "I think it's time to open that box now."