Thirteen-year-old Jon and his eleven-year-old sister, Tania, are typical kids—except Tania can communicate with ghosts. Their parents also happen to be the producers of a ghost-hunter television show—and have no idea one of their own kids can see ghosts. In The Ghost on the Stairs, the brother-sister duo join forces to help reunite a newlywed couple from beyond the grave. In The Riverboat Phantom, Jon and Tania try to help the ghost of a steamboat worker find peace at last—and find more than they bargained for on the river!

Jon and Tania are back and tracking down more ghosts, this time on the Mississippi River on an antique river-boat. With them are their mother and stepfather, producers of a hit TV show about "real-life" ghosts -- a topic no one on the crew seems to take all that seriously. But Tania has a gift -- she can see and communicate with ghosts, and this time she's in touch with the spirit of a riverboat captain who accidentally caused the boat to catch fire, and he's making trouble for everyone. Will Tania be able to help this troubled spirit find peace before disaster strikes again?