What does it mean to discover that you are kin to strangers? Not metaphorically kin, not spiritually connected, but genetically linked in ways that contradict everything you were taught about who your people are and who they are not?

This is the question at the center of my new novel, "The Kinship of Strangers," the third book in the Fractional Fiction series. And it is a question that has no comfortable answer, which is precisely why I needed to write about it.

We live in an age of genetic revelation. For less than a hundred dollars, you can spit into a tube and receive, six weeks later, a percentage breakdown of your ancestry. You can discover relatives you never knew existed. You can trace your maternal line back through mitochondrial DNA and your paternal line through Y-chromosome markers. The technology is remarkable. What we do with the information it provides is another matter entirely.

Your grandmother was frightened before you were born.

Not in the ordinary way that people are frightened, the startle at a loud noise or the anxiety before a difficult conversation. I mean something more precise. Decades before your parents met, before you existed as even a possibility, your grandmother experienced something that changed her at the molecular level. Methyl groups attached themselves to specific locations on her DNA. Genes that had been active went quiet. Genes that had been quiet began to speak. And that alteration, that chemical annotation of experience, passed forward.

You carry it now.

There is a forest in the Pacific Northwest that has been thinking for four thousand years.

I want you to sit with that sentence for a moment. Not to dismiss it as metaphor, not to immediately qualify it with objections about anthropomorphization or the hard problem of consciousness. Just to consider: what would it mean if something could think without a brain? What would it mean if memory could persist across millennia without neurons, without synapses, without anything we recognize as architecture for thought?

This is not speculation. This is what the science of mycorrhizal networks has been revealing for the past three decades. Underground, beneath every forest floor you have ever walked, fungal threads thinner than human hair connect trees into communication systems of staggering complexity. A single cubic inch of forest soil contains enough mycorrhizal threads to stretch for miles if laid end to end. These threads carry chemical signals, nutrients, water, and information. When one tree is attacked by insects, it sends chemical warnings through the network to other trees, which then begin producing defensive compounds before any pest has touched them. Mother trees preferentially channel resources to their offspring, recognizing kin through molecular signatures we are only beginning to decode.