The Dark Boatman

After Dexter inherits the old family mansion in Tormouth, on the death of his uncle, he visits the main library. Here he peruses the old records pertaining to Tormouth, and finds several references to the Dexter family. The documents trace their history back for almost four centuries. He locates numerous listings of births and marriages in the family, but not one instance of a death! Dexter begins to wonder if he's done the right thing in taking up residence in the house. What happened to his uncle, whose body is missing from the family crypt—and what's going to happen to him?