In this fourth book in the series, Abigail, Zack, Jacob, and Bo have two special challenges. They need to convince Dr. Martin Luther King, Jr. to lead the famous voting rights march from Selma, Alabama, to Montgomery, Alabama; and they've got to do it with the twins' baby brother, Gabe, in tow! Their mission turns out to be more challengin - and surprising - than any they've faced so far. But just when the kids think they're not going to succeed, they get some help from two very special people....

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