The Twist family move into their new home in a lighthouse and soon discover that the outhouse is haunted. Meanwhile, Nell suspects that Gribble, the estate agent, may have stolen an old painting of the lighthouse.
When Bronson asks where babies come from, Pete says they come from the cabbage patch. That night to everyone's surprise, Bronson really does find a baby in the cabbage patch. But he soon discovers that being a father is hard work.
When Pete touches Shovel, a ghost dog, he finds himself unable to say anything without adding the phrase "without my pants". The dog leads Pete, Linda and Bronson on a hunt to find the bones of Ben Byron, Shovel's master.