First published in 1968, the story tells the tale of three school friends who discover an ancient treasure and become embroiled in the final act of an epic battle of good against evil.

[3] On a school field trip, Jonquil (Jonk) Winters, an independent-minded teenage girl, is attacked by a large black dog whilst exploring the nearby woods where she has found a mysterious and rather old buckle.

Jonk's friend Bill Smith has read of a local legend that describes how a giant Green Man once strode across the countryside from Wiltshire to East Anglia.

However, cleverly guided by Elizabeth and aided by the gift of flight, Jonk and her friends determine to defeat the warlord and his sinister allies at any cost.

Since 1968, the original story has remained fairly timeless; however, it was deemed necessary for the author to make some minor updates to the language (e.g. changing "gym shoes" to "trainers").