To the Monster I Love, Vol. 3 (novel)

Two infamous Unlaw have escaped the capital, and the Elementary Detective Agency are dispatched to recapture them. Norman leads the group to a seedy casino for what should be an easy mission...only to be confronted by enemies from the not-so-distant past. To make matters worse, these villains appear to be a lot stronger than they once were. And as the battle heats up, the line between 'human' and 'monster' becomes that much thinner...