Meg and Michael have bought a very elderly house from the estate of the uncrowned Queen of the Packrats. She bought everything and kept it all. When the house became overcrowded, she moved the overflow into the barn. When the barn was crammed, she began filling the property's sheds. When she died, her "holdings" left the various grandnieces and grandnephews with decades of junk. They avoid the job of cleaning it up by selling the place "as is" to Meg and Michael, sticking them with the lot. Their solution: a yard sale. As always, Meg's large family flocks in to offer their dubious help. Many even come with junk of their own to add to the sale. Meg's mother, sure that Meg has taken care of all the "treasures," turns to drawing up elaborate redecorating plans. Meg's dad, newly elected president of SPOOR (Stop Poisoning Our Owls and Raptors) shoulders the cause of the endangered baby owls and their mother that live in the barn. His further contribution is the announcement that anyone who arrives in costume earns a ten percent discount. Meg is coping (barely) with all this until the body of a local antique dealer is discovered in an old trunk. She and her dad have a further shock: the trunk is in the barn, in reckless disregard of Dad's beloved newborn owls. The police temporarily close the sale down to investigate. When the professor who can swing the vote in favor of Michael's tenure becomes a suspect, Meg decides that the only way to prove his innocence, and avoid being stuck with several tons of unsold junk, is to find the killer herself, and quickly.