As already told in "The Rover Boys on the Plains," this trip was full of mystery and peril. Dan Baxter turned up most unexpectedly, and our friends visited a mysterious ranch only to learn that it was a rendezvous for a band of counterfeiters. Through a government detective the counterfeiters were rounded up, only one man, Sack Todd, escaping. Dan Baxter also got away, but later on he was traced to a big swamp, where his horse was found, stuck fast in the slimy ooze. It was thought by some that Baxter had lost his life trying to find his way through the swamp, but of this the Rovers were somewhat doubtful.
After the capture of the counterfeiters the boys and their chums had gone on to meet the ladies and the girls, and had spent a full week at the ranch of a friend, having the best times possible, horseback riding, hunting, and helping to round-up cattle. Then the whole party had gone back to the Mississippi, embarked on the Dora, as the houseboat was named, and floated down the mighty stream once more.
"This sort of thing is simply grand," Fred Garrison had remarked, as he stood on the forward deck of the craft, yet an hour later he had changed his tune. The houseboat had gone whirling in a bend of the stream, struck a snag and hurled poor Fred overboard. He was hauled up by Sam and Dick Rover, and then it was ascertained that the houseboat was leaking and would have to be laid up again for repairs.
They had stopped at the town of Shapette, a small place, and there they found a carpenter who promised to do what they wanted. When the houseboat was laid up the captain had come to them with a letter.
"My brother in Cairo is dead," said Captain Starr. "I shall have to leave you and look after his children."
The captain was an eccentric individual and the Rovers did not like him much, so they were perfectly willing to let him go. They decided to look around for somebody else to manage the houseboat and in the meantime run the craft themselves.
With the party as cook and general housekeeper was Alexander Pop, a colored man who had once been a waiter at Putnam Hall, but who was now attached to the Rover household. The boys had expected to leave Aleck, as he was called, in charge of the Dora while they visited a nearby sugar plantation, but the colored man had begged to be taken along, "jes fo' de change," as he expressed it. As Aleck had remained on the houseboat during the entire time the boys were on the plains Dick agreed to take him along; and thus, for the time being, the Dora had been left in the sole care of the planter.
After the visit to the sugar plantation the party had ridden to Shapette, to do a little shopping before returning to the houseboat. There Tom and Sam had left the others, to make certain that the Dora was in proper trim to continue the trip down the Mississippi. On the way Sam stopped at a plantation house to get a drink of water, and when he rejoined his brother it was to learn the dismaying news that the houseboat and the man left in charge of the craft had mysteriously disappeared.