A Welsh adaptation by Manon Steffan Ros of The Humbug Adventure, one of the titles of the Secret Seven series by Enid Blyton. We follow the seven friends as they raise the alarm about a spreading fire and find out who started it. Part of an exciting series that targets 5-8 year old readers and prepares them for the Famous Five series by the same author. Addasiad Manon Steffan Ros o The Humbug Adventure, un o deitlau'r gyfres Secret Seven gan Enid Blyton. Dilynwn y saith ffrind wrth iddynt atal tn rhag lledu a chanfod pwy gynheuodd y tn. Rhan o gyfres o straeon cyffrous sy'n targedu darllenwyr 5 i 8 oed ac yn eu paratoi at ddarllen cyfres Pump Prysur gan yr un awdures.