Tim Welch is a popular history teacher at the Montague Academy, an exclusive private school in Brooklyn Heights. As he says, "I was an odd-looking, gawky kid but I like to think my rocky start forced me to develop empathy, kindness, and a tendency to be enthusiastic. All of this, I'm now convinced, helped in my quest to be worthy of Kate Oliver." Now, Kate is not inherently ordinary. But she aspires to be. She stays home with their two young sons in a modest apartment trying desperately to...