Margrete Lamond 
Brahmin, the Tiger and the Jackal 

David and Andrew are back at Old Rusty’s isolated farm. Eager to solve the mystery of a diaphanous fourth wing on the windmill – they go caving. Once through the hidden entrance they are delighted to find a fantastic network of limestone caves, but their delight soon turns to terror when a gigantic creature emerges from the depths of the cave.