Voyage of Slaves is the third and final novel in Brian Jacques' Castaways of the Flying Dutchman series.

Ben is taken to Al Misurata, while Ned is found by a wandering troupe of entertainers that nurse him back to health.

While on his ship, the Sea Djinn, Ben and Ned jump overboard to escape, with the intention of rescuing their friends.

Once they reach Italy the boy and his faithful dog set sail once again for their destination with a friendly Greek sea captain.

Overwhelmed by sadness at the loss of his wonderful friends, but comforted by a heavenly vision that assures Ben that Serafina is in Heaven, the ancient boy and dog flee to the sea to get away from sorrows, and continue their eternal journey on the Blue Turtle.