[power to the J]

You don't need it. If somebody is reading book 3, then they've probably read 1 & 2, and if they're really lost and have forgotten what happened then they can just go to wikipedia or something. In today's world, I don't think it's too much of a problem. Also, recaps tend to be badly written and try to sound casual, and when I--as a reader--remember what happened perfectly fine, it kind of gets me mad when I read something badly constructed and cheesy. If I were you, just let the reader figure it out, or put in the page giving a breif explanation like so many other authors do.