It's the day before Thanksgiving and twenty-nine-year-old business owner Hank Hanson is about to tackle the annual challenge of visiting every one of his relatives. The product of a blended family, Hank has parents, stepparents, and former stepparents-not to mention an assortment of siblings-and feels the responsibility to see them all.

To give structure to his unconventional network, Hank compares it to a snowflake's intricate design. The only missing piece in his life, the element that would form that rare, perfect snowflake, is the love of an amazing woman.

When Hank meets Erin at...