The book "Outdoor Friends on a Barge; or, Mississippi Rivals" by Quincy Allen tells the exciting adventures of a group of friends who decide to go on a trip on their barge on the Mississippi River. During their journey, they encounter incredible obstacles and dangers, as well as secrets hidden in the dark overhangs of the river. This exciting book is filled with adventure, friendship, and loyal relationships that help the characters overcome any obstacles on their way. "Outdoor Friends on a Barge; or, Rivals of the Mississippi" is an exciting book that will take you into the exciting world of adventure and challenge of river travel.