Obscure 1E question: Who wrote the letter in 'Baptism by Fire'?

I am using Vampire 20th Edition to run the players through the original Chicago Chronicle from 1E. After spending a number of sessions with the players getting themselves situated in Gary, we have kicked off 'Ashes to Ashes'.

Note - this post contains **major spoilers** for 'Ashes to Ashes' and the other Chicago Chronicle books. They're 35 years old, but hey, I'm running them, maybe your GM might want to as well, so warning given!

I am mapping out 'Ashes to Ashes', just to make sure I understand what's really going on, and there is one major question I know my players are going to ask. For the life of me, I cannot find the answer - so I figured I'd see if anyone around here has more knowledge of old-school Vampire the Masquerade lore than me.

Ok, so, what is really going on in this scenario:

>!As a move in his ancient feud against Helena, Menele has done two things. First, he has dominated a ghoul, Roarke, into kidnapping Lodin, the Prince of Chicago. Second, he has had a letter delivered to Prince Modius of Gary, demanding the player characters present themselves to him in Chicago. The intent is that the players become scapegoats for the Prince's disappearance, and thus have to try to save him to clear their names, thus embedding themselves among the rulers of Chicago for Menele to use as pawns later, since Lodin and most of the other major players in the city belong to Helena.!<

It's convoluted, but OK, he's an ancient vampire with psychic powers, and 'manipulation by all-knowing methuselahs' is what you expect in old-school Vampire, I can roll with all that.

But here's what I'm stuck on: >!Where did that letter come from? It is delivered to Gary by Annabelle, Helena's grandsire, who appears to be firmly under Helena's control. It is said to be from Lodin, who is also under Helena's control. Helena specifically has the ability to block her own thralls from being Dominated by others.!<

>!So how did Menele arrange this part? Presumably Lodin didn't actually write it, but who did? I'm less concerned with the actual writing of the letter itself, than with how it wound up with Annabelle convinced it was real, and delivering it on Lodin's behalf?!<

Is this ever actually answered? If not I can just make something up obviously, but I figured I'd check if there is a real answer I just haven't been able to find.