In the dimly lit back alley, Molly and Bill huddled together, their breaths visible in the chilly evening air. The streetlights flickered, casting eerie shadows that danced on the graffiti-covered walls. The scent of old rain and trash filled the air, a familiar smell to these seasoned criminals. Molly, a petite woman with a mop of curly hair and a mischievous grin, adjusted the small backpack slung over her shoulder. "Alright, Bill," she said, her voice barely above a whisper, "You've got the fake invitations, right?" Bill, a tall, lanky man with a perpetual smirk, patted his pocket. "Got 'em. Little ones, too. Thought it'd add to the charm." Molly rolled her eyes. "Charm isn't our style, Bill. We're here to blend in, not win any beauty contests." Bill chuckled, a sound that seemed to echo off the cobblestone walls. "Well, we can't be too careful. You know how those rich kids can be." Molly smirked. "They're not the ones we're worried about. It's their parents we need to watch out for." Bill nodded, his eyes narrowing as he surveyed the street. "And the party's in full swing, too. The little brats are already tearing into their presents." Molly pulled out a small device from her backpack, a gadget that looked like a fancy phone, but with a few extra buttons. "This should help us get in undetected. It's a frequency jamming device. We'll be able to shut down any security cameras in the area." Bill looked impressed. "You've been busy, kid." Molly smiled. "It's not just about brains, Bill. It's about being prepared." Bill checked his watch. "Alright, let's move. The coast is clear." They stepped out of the alley, their hearts pounding with a mix of excitement and trepidation. The house was a grand affair, with lights twinkling and music playing, a stark contrast to the griminess of the back alley. As they approached the front door, Molly pulled out her fake invitation. "Ready, Bill?" Bill grinned. "Ready." They pushed open the door, and the noise of the party hit them like a wave. Children screamed with delight, parents laughed, and the air was filled with the scent of birthday cake and candy. Molly and Bill exchanged a look, their eyes gleaming with the thrill of the heist. Molly pulled out a small bottle from her backpack, a clear liquid that shimmered in the light. "This will do the trick," she whispered to Bill, handing him the bottle. Bill nodded, popping the cork and spraying the liquid into the air. Instantly, the house became enveloped in a thick, shimmering fog. The noise of the party faded as people began to cough and stumble, the fog causing temporary disorientation. Molly and Bill, their eyes watering slightly from the fog, slipped into the room containing the presents. They moved quickly, their hands working deftly as they packed the gifts into their backpacks. Suddenly, Bill stopped, his eyes widening. "Molly," he whispered, pointing at a large, beautifully wrapped present. Molly followed his gaze. "That's got your name on it." Bill nodded, his eyes scanning the room. "And it's not here to be stolen. It's the birthday present." Molly looked at Bill, then at the present. She sighed. "Alright, we won't steal it. But we will take the rest." Bill nodded, a grin spreading across his face. "Agreed. Now let's get out of here before the fog wears off." As they slipped out of the house, unnoticed and unheard, they left behind a room filled with presents and a confused, disoriented party. The heist was a success, but for once, Molly and Bill had left something behind. A small, unopened present, waiting to be opened with all the joy and anticipation it deserved.