By Leslie Lindsay  THE LEAVERS is at first a story of immigration/deportation, social justice, adoption, but it is so much more: it’s about heart, family, culture, and dare I say: required reading.  It’s hard to believe Lisa Ko’s THE LEAVERS (May 2, Algonquin Books) is a debut. It’s eloquently crafted, well-researched, and absolutely beautifully executed. In fact, Lisa is the latest winner of the PEN/Bellwether Prize for Fiction, awarded by Barbara Kingsolver to a novel that addresses contemporary issues of social justice. Timely, topical…and oh, so emotionally rich, it’s really hard to categorize THE LEAVERS–but ultimately, it’s darn good fiction with well-developed, fully dimensional characters; I loved every one of them and for different reasons. Deming Guo’s mother, Polly (Peilan), an undocumented Chinese immigrant, fails to come home from work (a nail salon) one day, and he’s left on his own. He’s eleven. (On a personal note, I have 10 and 12 year old daughters–I couldn’t imagine!). He’s in limbo for awhile while family friends decide what’s best for him. Deming is eventually adopted by ‘older’ …