Book excerpt: "The Covenant of Water" by Abraham Verghese

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Dr. Abraham Verghese teaches medical students at Stanford University's School of Medicine.  But he has another calling: author. His novel "The Covenant of Water" (Grove/Atlantic), a multi-generational tale of a family in India experiencing love and tragedy, was a New York Times bestseller, and an Oprah's Book Club pick.

Read an excerpt below, and don't miss Tracy Smith's interview with Abraham Verghese on "CBS Sunday Morning" April 21!