The cottage in Mr Hick's garden mysteriously burns down one night & five children think someone started the fire deliberately. Mr Goon the local policeman thinks so too & isn't at all pleased to have the Five Find-Outers & Dog nosing in on his mystery. There seem to be lots of suspects
- Mr Peeks Mr Hick's valet has just been rudely dismissed Mr Smellie argued with Mr Hick the day of the fire there's a suspicious-looking tramp in the fields nearby & even Mr Hick's housekeeper has a reason to have done it. The children bump into Inspector Jenks fishing by the river one day & talk to him about their theories. Inspector Jenks is senior to Mr Goon who still doesn't want to listen to the children & praises the Find-Outers as they reveal the true culprit
- Mr Hick himself who burnt the cottage for the insurance money.