What's the Name of That Book??? discussion

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

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?

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.

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

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

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

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

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