If you’re on my email list or following me on social media, you’ve already heard me going on about dual-timeline novels, about how much I love to read them and marvel at the skill it takes to write one.

Where is all this coming from? I think two places:

1. Discovering Susanna Kearsley’s novels, and

2. Finding out that Kate Morton has a new novel out (which I possess in a beautiful hardcover).

Although I’ve...