User blog comment:Essie Essex/Arkane Studios Announces Dishonored 2/@comment-1500935-20150615102850/@comment-4807396-20150713010430

It's possible that Theodanis, Luca's father, is the person Emily and Corvo are accused of killing. That makes way for Luca to take over and explains why Emily and Corvo are in Serkonos to begin with. It's a throwback to the event that kicks off the first game, too.