I am at a loss to understand how anyone can compare this novel to any of Daphne du Maurier's, and even more bemused by the comparisons drawn between The Secrets Between Us and Jane Eyre! It's a good story, a page turner even, but up there with these gothic classics, definitely not, by virtue of the fact that the characters are simply not sufficiently developed or compelling to elicit the sympathy of the reader. Neither Daphe du Maurier, nor Charlotte or Emily Bronte, wrote plot driven narratives.
Why not simply allow the novel to stand, or fall, on its own merits, without making these absurd claims? The author herself tells us the story utilizes themes drawn from Rebecca, My Cousin Rachel, Jane Eyre and Wuthering Heights - in doing this she raises expectations which are almost certainly bound to fail in my opinion.