Secrets, by their very nature, are hard to keep.
It therefore follows that secrets in novels are even harder to keep concealed from the reader. They (the secrets) are always wanting to be found out and it takes a skilled author to weave enough subplot and red herrings to keep the suspense alive.
One such modern author who is able to do this is Kate Morton, creator of 'The House at Riverton' and 'The Forgotten Garden'. Both novels concern themselves with secrets hidden for generations and move between the past and present with a deft ease that captures the reader and sweeps them along in the whirlwind of all that life can encompass.
They are intensely readable - both are doorstops of novels, but the pages are quickly turned. I had intended to take 'The House at Riverton' on holiday, but found myself too engrossed to go slowly, and it was a matter of two days before I found myself at the final pages.
Secrets are hard to keep, but at least the readability of Kate Morton's books are one secret I am able to share!