The Sleuth Club members organized in the Door to Nowhere (1964, p. 57, J-27), spend a vacation in Cedar Valley at Constellation House, a mansion belonging to Grant Fielding, detective Paul Tangent's uncle. The attractive California resort own has been disrupted by a mysterious arsonist who attacks the homes of the leading citizens, and it appears that the entire community may be destroyed during a 4th of July pageant in which an historical fire is simulated. Although the citizens are all hostile to the investigations by the club, the boys manage to track down the necessary clues, which Tangent fits together to solve the mystery. The culprit, who turns out to have been masquerading as the town's notoriously eccentric woman, and who is out to avenge his mother's death, is trapped in an exciting chase backstage at the pageant. Although it requires some awkward juggling to fit together all the complications of this mystery, there is plenty of good surprise and suspense to please readers who want to sleuth along with the club members.