Lightning by Danielle Steel

Summary
In Lightning, bestselling novelist Danielle Steel tells the story of a woman whose life is changed by one swift, unexpected stroke of fate.

As a partner in one of New York's most prestigious law firms, Alexandra Parker barely manages to juggle husband, career, and the three-year-old child she gave birth to at forty. Then lightning strikes - a routine medical check-up turns her world upside down when tests reveal shattering news. Her husband Sam, a Wall Street whiz-kid, is as proud of his long-time marriage to Alex as he is of his successful career - until he is caught off guard by Alex's illness. Terrified of losing his wife and family, Sam fails to provide any kind of emotional support.

Almost overnight, Sam takes his distance from Alex, and they become strangers. As lightning strikes them yet again, Sam's promising career suddenly explodes into disaster, and his very life and identity are challenged. With his future hanging in the balance, Alex must decide what she feels for Sam, if life will ever be the same for them again, or if she must move on without him.