Unlisted ME Patchett Book?

I just found a copy of The Great Barrier Reef by Mary E Patchett, author of the Brumby and Ajax books.

It was not listed in her works here on LT, so I added it. Are any of you familiar with it? Is it part of the Ajax or Brumby series, perhaps renamed?

Thanks!

Her fan site says:

"There may be another book in the series but nobody seems to know what it is, or indeed if it actually does exist!
Although the books are all set in Australia and written by an Australian author, they were first published in the UK. I think only the first two were reprinted in paperback and indeed these are the easiest ones to find, both in the UK and in Australia and also in America. The other titles are a lot rarer in all countries, and can be quite expensive to buy."

So if it is, that's pretty durned exciting for you.

It is.

I guess once I read it I'll have a better idea where it fits (if at all) in one of her series.