Rizal opens with Todo se sabe, everything gets out: despite precautions, mutilated rumors reach Santa Cruz, and Orenda's parlour abandons cards and chongka for Chichoy's tale while little Tinay cannot see why cowries matter less than conspiracies. The silversmith delivered Pelaez earrings while workmen dismantled the azotea kiosk and found sacks of powder under floor, roof, table, and chairs, lucky no smoker struck a match. Capitana Loleng, brave amid Momoy's terror, hears that Timoteo and Simoun alone superintended the house; the lieutenant swore everyone to secrecy before sending Chichoy away. Capitan Toringoy imagines Calle Anloague annihilated; Momoy shudders remembering he sat near the kiosk.
Guesses fly: friars, Quiroga, students, Makaraig, until a clerk's whisper names the jeweler Simoun, believed because the story seems absurd, credo quia absurdum. Momoy remembers Simoun left before dinner to fetch his gift; Sensia decides Aunt Tentay was right that Simoun is the devil buying Spanish souls. Capitan Toringoy removes Simoun's ring; daughters recall sulphur smells and blue flames while the Guard searches for the vanished jeweler. Even guests who bought gems from Simoun now cross themselves over trays of pearls.
Talk turns to last night: the General's light failed, an unknown thief stole Simoun's lamp and jumped the river, perhaps Spaniard, Chinaman, or Indian, intending fire to reach the powder. Momoy performs outrage for Sensia; Capitana Loleng mourns debtors who would have died and a house too close to the blast zone. Capitana tells Isagani to hide lest he be blamed; he smiles and says nothing until he judges the thief: wicked to take what is not yours, and if the thief had understood, he would not have acted so, for nothing would induce Isagani to take his place. He paces while others speculate on the Black Hand.
An hour later Isagani bids farewell and leaves forever for his uncle's side, carrying the secret Rizal shares with the reader. Official silence breeds parlour theology and devil stories while the man who threw the lamp walks free in plain sight, unnamed and misjudged. When gossip names Simoun but blesses the thief, who still knows the difference between rescue and robbery?