Mary Trace is bright, bubbly and back in the dating pool in her midthirties. All of her closest friends are in love, and she refuses to miss out on romance. So when a regular customer at her trendy Brooklyn boutique wants to set Mary up on a blind date with her son, she gives a hesitant yes. John Modesto-Whitford is gorgeous and well-groomed, so maybe dinner won’t be a total bust—until he drops a less-than-flattering comment about Mary’s age. Desperate...