Hey, it's NPR's Book of the Day. I'm Andrew Limbaung. Even under the best of circumstances,

migration often involves a separation of sorts. Almost by definition, when someone leaves,

someone else gets left behind, and that's just the deal you make when you choose to migrate.

But when family separation happens at the border, it's a completely different

ballgame. Efren Olivares is an immigration lawyer who represented families who were separated

under former President Trump's zero tolerance immigration policy. And his book, My Boy Will Die of

Sorrow, is a firsthand account of his time at the border as all of this was going down.

And he told here now as Deepa Fernandez that what he wanted to accomplish with this book

was something more complex than regular reporting could offer. And nothing exemplifies that more

than the story of him running into an immigration agent at the gym of all places.

That's in a minute.

In the U.S., national security news can feel far away from daily life.

Distant wars, murky conflicts, diplomacy behind closed doors.

On our new show, Sources and Methods.

NPR reporters on the ground bring you stories of real people helping you

understand why distant events matter here at home. Listen to sources and methods on the NPR app or

wherever you get your podcasts. It's been more than four years since the Trump administration's

zero tolerance policy that separated children from parents who were crossing

the border without documentation. We remember the reports of crowds of children, some as young as

six months old, fenced in, crying for their parents. Around 5,000 families were separated, and the

ACLU says about a thousand still remain apart.

Our next guest watched the separations unfold.

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