Sherlock was bored, which was never a good sign. John was fighting back an urge to run out of the flat but then poor Mrs Hudson would have to cope with the unruly detective. He was relieve when his phoned went off and quickly answered it.
"Hello?"
"J—John – " sobbed a voice.
"Harry? Are you okay? What's wrong?"
"It's Melissa…s-she's dead."
"Oh my god." John gasped. Melissa was Harry's first serious girlfriend after Clara. They had been dating for almost a year. "Where are you?"
"A-at the police station."
"I'll be right there."
John hung up and started to put his coat on.
"Where are you going?" asked Sherlock.
"To see my sister."
"What's she done this time?" Sherlock sighed.
John glared at his flatmate.
"Nothing! Unless you think she's capable of murdering her girlfriend!" he snapped.
Sherlock's face lit up.
"Murder?"
John wanted to slap himself.
"I don't know. I'm going down to the police station to see her." Sherlock started to put his trench coat on. John supressed a groan. "If you're going to come please don't talk to her!"
"You worry too much John." said Sherlock. "Now are you coming or not?"
John wasn't quite sure how his flatmate had managed to get ready beside the door before him but it had happened. He sighed and nodded nonetheless.
It didn't take them long to get to the police station. When they arrived Lestrade walked up to them smartly.
"Hello Greg have you seen my sister?" John asked.
"She's just come out of the interrogation room." Lestrade informed him, pointing in Harry's direction.
"Thanks."
John hurried over to her leaving Sherlock and Lestrade together.
"How did the victim die?" Sherlock asked, not beating around the bush as usual.
Lestrade sighed.
"All evidence points towards a drug overdose – "
Sherlock groaned.
"Boring."
"-but her face was smashed in."
"Go on." said the detective, interest piqued.
Meanwhile John was busy trying to console his devastated siser. For the moment it simply meant a lot of hugging. John knew that it would get harder in the later stages of grief but for now this was what Harry needed. However his view over her shoulder meant that he could see the look of growing glee on Sherlock's face.
"Oh no." he muttered.
Harry broke away from him.
"What is it?" she sniffed.
"I think Sherlock may be interested in Melissa's death."
"Isn't that a g-good thing?" said Harry. "I-if he's as good as you say t-then maybe he could h-help?"
"Yes, but you haven't met him."
Sherlock began to stride towards the pair. John stood and went to meet him.
"Change of plan John, this case is promising. I need to talk to your sister."
"Sherlock!" John complained. "You promised!"
"No I didn't. I just said you worried too much, that I can promise."
He took another step towards Harriet but John barred the way.
"Fine but only if you let me do the talking." Sherlock tried to sidestep John but failed. "We can do this all day."
"Fine." the detective grumbled.