Book for mothers day

Hi

After spending a fruitless lunch hour in Waterstones today looking for a book for my mum i wondered if anyone had any recommendations.

My mum is 68 years young. ... likes spooky thriller type books but not overtly supernatural. Barbara Erskine comes to mind but id like something a bit more modern.

Mum is forever on her holibobs these days so a paperback would be good.

Thanks v much