As soon as you complete his Reading the Rumble quest, Giovanni will begin parsing out this two-part opus. Unfortunately, it does not seem to have any components in common with the quest that Magnus will likely be handing you around the same time (Dyed in the Wool). Instead, Giovanni is heading off in a completely different direction; toward the Phoenix Perch.
Of course, given the difficulty in collecting Mystical Orbs (info about the best combo to find Mystical Orbs here), it will likely take a while to complete the second half of this quest! Once you do complete it, however, you'll be given the Magic Quill questline, also from Giovanni.
Part 1 of 2
Part 2 of 2
Expand to the Phoenix Perch
Send Giovanni to the Phoenix Perch
Find 2 Phoenix Feather