ABANDONED. Book about spaceships that go into islands? Book read in UK.

[Naomi]

My husband is trying to recall a book he read years and years ago in the UK. The info he can remember is: Unknown spaceship that went inside islands, possibly in Paris, and the areas inside where named. A long shot, I know...

[Kris]

Naomi, around what year did he read this book? I find "years ago" can mean different things in this large group.

Is this science fiction (or fantasy) book for young adults (teens) or older adults?

Is this an alien invasion? Can he remember anything around the main characters?

What does "the areas inside where named" mean?

[Lobstergirl, au gratin]

Naomi, are you still looking for this or did you find it?

[Michele]

When you say "went inside islands" and "go into islands" could you explain in a bit more detail what you mean?

[Kris]

No response, moving to Abandoned folder.

Naomi (OP) was last active on the site in November 2017.