The children encounter a group of gypsies determined to visit a desolate place called Mystery Moor. An elderly blacksmith tells the children how gypsies, in the past, sabotaged a railway run by a family of sand miners, causing most of the family to mysteriously disappear when the moor was covered by a thick mist.

In book twelve, somebody is flashing lights from the top of the old tower on the treacherous rocks off the Cornish coast.
The Famous Five sense danger. But can they solve this mystery without getting hurt themselves?

‘Julian! Where are you?Where’s Timmy? They’re after me, I tell you; they’re after me!’
This Easter, The Famous Five are packing up their tents to go cycling off on holiday, and they can’t wait.
But the fun turns to danger when Dick is Kidnapped in a case of mistaken identity. The other make a plan to find them, but their rescue mission soon goes wrong! will they be able to save Dick – and themselves?

Spook trains in the dead of night! And they seem to vanish into thin air -but where do they go?The Famous Five are on to it! But discovery of an unusual underground tunnel system, and a secret train-service, has them puzzled. If they follow the tracks, will they solve the mystery?