Please add book to my series

[Lucinda]

Can I have this book:
https://www.goodreads.com/book/show/3...

added to this series:
https://www.goodreads.com/series/1850...

Thank you!

[Betsy]

Done.

[☕ Lachgas ♿]

Do the books have the same characters or are set in the same universe? (and which)
(the description doesn't really sound like that's the case... so I'm wondering)

[Lucinda]

Betsy wrote: "Done."

Thank you, Betsy!

[rivka, Former Moderator]

I repeat the question: what do these books have in common other than both being set in Portugal?