"Joan!"
"Yeah?"
Joan poked her head out of the kitchen into the living room.
"Can you come over here?"
"Well, you're being pleasant. Of course." She walked in, holding her cup of coffee.
"I have been contacted by Bell. He asked me if we could do an undercover case."
Joan took another sip of her coffee, motioning for him to continue. He took a deep breath.
"We have to go undercover as a married couple."
She spit her coffee all over his face.
"WHAT!?"
Sherlock reached quickly into his pocket to pull out a handkerchief which he used to wipe his face of the hot liquid.
"You heard me, Watson."
"Wh-wh-why?"
"I'll explain. There is a killer out there that has been killing young pregnant women. We suspect it is a doctor named Molly Carmen. We also suspect this is an alias. What we need to do is act like a married couple and go to this doctor because you are "pregnant"."
"So you're saying she might kill me."
He shook his head.
"No, Joan, I could never put you in danger."
She tipped back her head and laughed at that. He looked exasperated.
"What she does is she prescribes the women a medicine that kills them from inside. She makes it herself, which is why it isn't checked."
"Alright, but how am I," she patted her stomach, "a non-pregnant woman going to show up pregnant on tests and stuff?"
"We've thought of that. There is a drug you can take that can alter your metabolism and other systems to make you show up pregnant on tests."
"Do I have a choice?"
He nodded. "Yes, you do, but just know that if you decline, more and more innocent woman are going to die."
She sighed. "I-I accept."
He jumped up out of his chair.
"Thank you Watson!"
Watson smiled. "You are welcome."