Paul
Paul asked Marilyn Foxworthy:

Hi Marilyn! Thank you for your great stories! I think these are unique. I have read all your books ( up to " The Dark Atoll ") and ask myself whether and how the individual volumes are related to each other. For some it is obvious but others I could not (yet) place. What are the big correlations in your unique multiverse? Thank you very much and I hope for many more entertaining and exciting stories. Paul

Marilyn Foxworthy Good question. OK, Robby Jensen is the one that we haven't really gotten much detail on yet. His stories are part of the Girls On The Hill series and hasn't been published yet. There are three written, and they were the first books of this type that I wrote, but there have been reasons for not publishing yet. Maybe this fall. We Robby see in the stories about his brother Tom, and Joshua and Florin mention him several times.
So, without giving anything away, Robby has two brothers, Tom and Mark. We have the start of their stories. Robby, Tom, and Mark's stories happen more or less present day, but Mark is far far away geographically, Robby has several children but the only ancestors we know so far are Florin and Joshua, two of his grandsons. Their stories take place a few centuries apart.
That should place the Girls on The Hill, The Sea Nymphs, The Nogud Legacy, and The Castaways in relation to each other. As far as we know, there isn't a relationship between Robby and the Guardian Maidens. Not that we know of. There doesn't seem to be a relationship between Robby and the upcoming Lost in Time series and the first book, The Cave Girl. Thanks for asking, and especially thank you for reading my books and encouraging me to write more. Happy Trolls.

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