Ida B: . . . and Her Plans to Maximize Fun, Avoid Disaster, and (Possibly) Save the World Who is the antagonist in Ida B: . . . and Her Plans to Maximize Fun, Avoid Disaster, and (Possibly) Save the World by Katherine Hannigan? Asked by bookragstutor on 20 Aug 12:55 Last updated by Jill W on 09 Jan 11:33