Elizabeth watched in wonder as the bowl of goo rose. It was a green, slimey solution that Sherlock was messing around with. He had just poured a pinkish liquid into the bowl, and now the slime was rising like a loaf of bread.

"Cool," Elizabeth murmured as the slime kept going. It was nearing the edge of the bowl now. Was it going to go over?

Yes. Yes, it was.

Suddenly the slime's rising sped up, and it surged over the sides of its container. But instead of stopping it, Sherlock dumped the whole beaker of the pinkish liquid into the goo.

"What are you doing?" Elizabeth asked, exasperated. The goo roared across the kitchen table.

"It's an experiment!" Sherlock said gleefully, making hurried notes on the back of his hand. Elizabeth's eyes widened as some of the goo began to ooze to to the floor.

"Can I touch it?" Elizabeth glanced at Sherlock. Sure it would be a big mess to clean up later, but right now, it was fun.

Sherlock shrugged, "I don't know. Hang on." He plunged a finger into the slime. When nothing happened, Elizabeth let some of it run onto her hand.

The slime kept going, and soon it had swamped around their feet and ankles, encasing them in goo. Elizabeth was glad she hadn't been wearing shoes, this could definitely stain. Luckily the slime began to slow its descent and had fully stopped before it reached the carpets of the living room and landing.

Elizabeth sighed in relief, at least she didn't have to shampoo the carpets this time. She went to pull her feet from the goo.

But she couldn't. She was stuck in the slime!

She tugged and tugged, "Dad, can you get your feet out?" Sherlock frowned and tried to move, but he couldn't either.

"Oh my God!" Elizabeth cried, frantically trying to pull her feet out. They were sitting ducks. Their phones were in the living room, and Mrs. Hudson and John were both out.

"Fascinating!" Sherlock clapped his hands. "A substance that rises, prowls, and encases its victims. Like amber and flies, but better!"

"Be excited when we're out of it!" Elizabeth was still trying to pull her feet out. She had no desire to be stuck when this goo suddenly started burning their skin off.

"It shouldn't do that." Sherlock deduced her thoughts. "But I do not have an agent prepared to get us out. Quite frankly, I didn't anticipate that this would happen."

"I'll admit that this is really cool." Elizabeth said honestly.

"But you would still like to get out."

"Yes, good deduction."

Sherlock glanced around the kitchen, searching for something that could help them escape. He reached for the counter and grabbed a knife that had been left out at breakfast.

He bent at the waist and began to saw at the goo around his ankles.

"Oh, please don't do that!" Elizabeth looked away.

"Why not?" He didn't stop cutting the slime.

"You are going to cut yourself!"

"No, I'm not!" Sherlock ignored her protests and kept freeing himself. After a few minutes, he had managed to carve a little path and cut his feet out. Elizabeth wasn't sure how he had happened not to cut himself. She had flinched everytime the very sharp knife came close to his skin. She let out a breath she didn't know she'd been holding when he finally walked out onto the landing.

Then Sherlock began to saw a path to Elizabeth. She let him clear the floor, but when he neared her feet she stopped him. "Oh, no! You are not putting that knife anywhere near my feet." Sherlock sighed, but he obliged, setting the knife on the counter. Now Elizabeth had a clear path to the landing if she could get her feet out. She pulled again in vain.

"Alright then," Sherlock strode forward and grabbed her around the waist. He backed up and pulled Elizabeth with him. When her feet came out of the goo, they made a loud sucking noise. Sherlock set her down and went back to carving pieces of the slime away from the floor.

Elizabeth surveyed the mess in the kitchen. This would take hours to clean up.

She grabbed another knife from the counter and set to work.