In the beginning of section 6, Fatty writes another letter to inspector Jenks. this time he tells him that the five find-outers are locked in the secret room in invisible ink. Then they threw it out the window so inspector Jenks can get it.
Inspector jenks didnt get the letter they wrote so the five find-outers tryed to escape and it worked. while they were running away they found inspector Jenks. they told him everything that happened.
Inspector Jenks went to the Hilton house and caught the 2 men who had locked the five find-outers and who were doing there secret business in the haouse.