Arthur Ransome 
We Didn’t Mean to Go to Sea [EPUB ebook] 

‘Now Susan, ‘ Mother said, ‘And you too, John. No night sailing. No going outside the harbour. And back the day after tomorrow. Promise.’But promises can’t always be kept. Within twenty-four hours John, Susan, Titty and Roger find themselves fighting a night gale in the treacherous waters of the North Sea, adrift and in the main shipping lanes. Suddenly, it’s real adventure and only their sailing skills can help them now.