I'm a well read grad student who's bluntly honest about all things, although I try to be most honest about myself.
Because Highbrow is the Autobot Hostage.
http://tfwiki.net/wiki/Autobot_Hostage
Going alphabetically, by the way, Highbrow is number 483 on my list of characters for this challenge. This is really going to take years!
Anyway, The Abducted Alchemist was even more fun than the first novel tie-in. While I wished there had been more illustrations - I love Hiromu Arakawa's illustrations, and there were less in this one - there also wasn't the issue with eye color, etc, so I was far happier with this book. The two seemingly unconnected story lines of terrorist bombings and the abduction of children connected to the military (via their parents) were connected, partially through Edward and Alphonse, but mostly through Roy Mustang who was convinced the cases were connected. It was a lot of bureaucracy, though, which bound his hands as he investigated the abductions, which weren't causing as much civil unrest as the bombings of the train lines, one of the major methods of transportation in this world.
The way that Edward and Alphonse figure out who is responsible ties into Roy's investigations, and give him the answers he needs to solve both cases. It relied more on action than anything else, but not at the expense of character development. Overall, a highly satisfying tie-in for a FMA fan.