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Here is a free book that my child read and enjoyed, and as it is free, thought I'd list it.
Premise:
When twelve year old Joe and his two younger sisters, along with their friend Will, go camping on a deserted island off the coast of England, they fall headfirst into another exciting adventure.
Follow the children as they are trapped in a lighthouse, stow away on a seaplane, get lost in a mine, hide in a tree house, outwit birdwatchers and more!
Book 2 in The Mystery Series, this adventure novel is set in 1950's Britain and will suit people who enjoy Nancy Drew, the Hardy Boys or the Famous Five.
You'll probably need to read book 1 "Smugglers Cove" first - $2.99
Good find OP