SOLVED. Fiction Brother and Sister trying to escape from an island. [s]

[Jim]

I am looking for a book that my wife read in the UK about 8 years ago about a brother and a sister who end up getting sent to an island where there is a church and some sort of religion. The book is about them, their relationsip and relationship with their captors, trying to escape from the island and they have a number of trials and tribulations trying to achieve this. They eventually get separated with the book ending with the boy in the church staring up at the stainglass window.

Jim

[Lobstergirl, au gratin]

Moving to Unsolved since you're looking for one specific book.

What genre is it - realistic, fantasy, horror? Adult or YA? Remember the cover? Author male or female? Would you use the word cult to describe what is happening?

[Jim]

Hi, a bit horror. It was YA with a dark cover though cannot remember more on this. Dont know about the author and my daughter said yes to the cult question. Hope this helps.

[Kris]

The Cure by Michael Coleman?
Escape from the Island of Aquarius by Frank E. Peretti?

[Jim]

We think The Cure is it. We've ordered the book to see. Thank you very much.

[Kris]

Please come back and let us know if it's the one.

[Lobstergirl, au gratin]

Jim, was "The Cure" your book or are you still looking?

[Lobstergirl, au gratin]

No response but Jim thought that was the book. Moving to Solved.