Hm. If I'm remembering right - the Loremistress said that someone stole Agatha from them. Implied that she had no idea what the hell happened or how, just one day, Agatha was gone. Lu was also heavily pregnant when she turned up to the Geister retreat, and I think the Loremistress implied that Lu stayed for some time after Agatha was born in order to recover and regain her strength before going back out to deal with whatever had sent her fleeing before. And when she came back, Agatha was gone. So the "Lu dropped Agatha off and paid minimal attention and buggered off somewhere far away" theory does have a solid basis for it, at least. But you're right that there's holes and we don't have anywhere near enough info from anyone; if I'm remembering right, Punch and Judy said that Barry turned up with Agatha one day, and that she looked about three or four at the time. He stuck around till she was eight, heard her humming and saw her making things, and made the locket and put it on her, and then left shortly afterwards - and didn't come back very often or do great about staying in touch. I feel like it's probably not connected to Lu's true body. I vaguely recall mention of the signal itself being older than Lu and wildly different from anything she'd ever touched - that she was just hijacking something someone else had set up. If I'm remembering right, it got disassembled and evacuated with the Geisterdamen; I mostly suspect that because I vaguely recall a lot of speculation in the Agatha's Minions LJ community about whether the Geisters could be creating other Lu copies now that they were in hiding, back when that first happened. On more current topics - why does the Master have child-snaffling wagons?!? I mean - I know logically the 'why'; they're good for collecting truants and juvenile delinquents. But on the other hand: why does the Master have child-snaffling wagons that try to tempt kiddies with rice pudding and have the capacity to bathe the kids? Why this? Why do they look like ominous clowns?