Noon
"Why should we trust you, Regulus? You're a Death Eater!" Sirius snarls.
Regulus bows his head, drawing his 3-year-old daughter near. Speaking with innocence, with perfect truth, Britainia says, "They killed Mommy. To hurt Daddy, they killed Mommy. But we can make him, the Dark Lord, pay for what he's done." They stare at her.
"Do you trust me now? I wouldn't involve my own daughter in any of this unless I had no choice. Please, just take these sketches and finish it."
"Very well, Regulus," says Dumbledore. "But you must be there with us."
Taking a deep breath, Regulus nods. "I expected as much. But someone must watch Britainia. I can't leave her to the mercy of my mother."
Sirius nods in solemn agreement. "I can watch over her until your return."
"No, Sirius. James and I will. She can have a little sleep over with Harry," Lily interrupts. With that settled, those going Disapparate.

Midnight
In silence, four figures approach the gates of a mansion.
"State your business," the gates command.
"I seek an audience with the Dark Lord, to beg his forgiveness and introduce new followers to him," Regulus answers. The gates melt away at his touch. "Walk swiftly and silently. None will awaken. I frequently come here so late, bringing converts to meet him. It is the only time I can safely do so."
"This is where he's been hiding? The Malfoys?" Sirius asks incredulously.
"Yes," his brother answers simply. The doors open as they near. Without pause, they cross the threshold. A house-elf appears.
"Is you looking for the Dark Lord, Master Regulus?"
"Yes, Dobby. The study?"
"Indeed. He fell asleep at the desk. I'll go wake him."
"That won't be necessary, Dobby. Go back to bed. Oh, and forget we were ever here. You are never to mention our presence to anyone at any time, EVER. That's an order," says Regulus quietly.
"Yessir," answers a confused Dobby, disappearing into the kitchens.
Walking forward to the slightly ajar door before them, Regulus motions for silence. He carefully opens the door -
To find his Master wide awake and waiting.
"I thought you might come, Regulus. Who are these?" comes the cold, high-pitched voice of Lord Voldemort.
"Converts, my Lord."
"Such lies, Regulus. Who are they?" Voldemort replies silkily.
With a flick of his wand, Dumbledore freezes Voldemort into immobility.
"This is the end, Tom. No Horcruxes left to protect you," he says solemnly, pulling out the remains of 5 mangled objects.
Tom's eyes widen in terror.
A green flash.