Request #226

I am trying to locate a book that was written in the 1960s about a set of twins, June and Julia (one born on June 30th, the other July 1st). It was a mystery and I believe set in Australia. One thing I remember about it is there is an illustration of one of the sisters bending down to look at a Succulent – the first time I had every come across this word – and the name Succulent was part of a clue.
I think it was a female author whose name began with M – perhaps Margaret?

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