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|Series||Swallows and Amazons|
|28 November 1939|
|Media type||Print (Hardcover & Paperback)|
|ISBN||978-1-56792-064-2 (David R. Godine, Publisher: paperback, 1996)|
|Preceded by||We Didn't Mean to Go to Sea|
|Followed by||The Big Six|
It brings the Swallows and the Amazons together and introduces a new group of characters, the Eels and the Mastodon. Ransome used to sail to Hamford Water, an area of tidal salt marshes and low-lying islands, in his yacht Nancy Blackett. He set the book here to offer his characters new opportunities to explore and make maps in a different landscape.
The Swallows intend to sail in the Goblin (as featured in We Didn't Mean to Go to Sea) to Hamford Water and camp with their father, but he is called away on naval business. Instead he maroons them with a small dinghy on an island. Before he leaves, Father gives them an outline map of the area they decide to call Secret Water and suggests they survey and chart the area before he returns to pick them up. For the first time, their small sister Bridget accompanies them on this adventure. For a surprise, Father has arranged for the Amazons to come down from the Lake District and join them with another dinghy.
They see some mysterious footprints which they think look as though they were made by a Mastodon, but turn out to have been left by a local boy wearing mudshoes. He mistakes them for the Eels, another family who camp in the area regularly. Later the Eels arrive and are initially hostile before they settle down for a friendly war, culminating with feast of the Sacred Eel, complete with "human sacrifice". The "sacrifice" is Bridget, who very nearly does not arrive at her party, as a result of being trapped in the middle of a ford by a rising tide with Titty and Roger. The danger is genuine, since high tide level would have been well above their heads. They are rescued by the Mastodon in the nick of time.
It seems that due to the distractions of war and being cut off by the tides, the chart will not be completed. However early in the last morning two separate groups of children complete it.