In this book you can share with Tamzin and Rissa (whom you may have met before in Wish for a Pony, The Summer of the Great Secret and The Midnight Horse) another high adventure on the Romney Marsh. This is an autumn and wintertime story, and is centred in and around the solitary farmhouse of the Merrow family, where Tamzin and Rissa keep house for the shepherd and his son in Mrs. Merrow's absence. Here they grapple with domestic problems and the hazards which arise from a plan by some city men to build a holiday camp.
Disguising themselves as the dreaded White Riders, they gallop with their friends Meryon and Roger over the marsh at midnight, and by other daring schemes succeed in beating back the invaders. But it is a close and perilous fight.

Monica Edwards has lived for years on Walland Marsh, and this is the part of Romney Marsh that she knows best. All her backgrounds are accurately drawn, and though some of the names have been altered, the castle, the ferry, the farmhouse, the Vicarage and all the rest, are there for you to see if you should some day find yourself on Walland's wide, wet and windy acres