When an elderly woman decides she will stop at nothing to give her granddaughter a special gift for Christmas, she brings together cab driver Finn Parrish with first-year law associate Sydney Batson.

As a first-year law associate, Sydney Batson knows she will be updating her resume by New Year's if she loses her current court case. So when her grandmother gets inexplicably ill while she's in court, Sydney arranges for a cab to get her to the clinic. The last thing cab driver Finn Parrish wants is to be saddled with a wheelchair-bound old lady with dementia. But because Miss Callie reminds him of his own mother, whom he failed miserably in her last days, he can't say no when she keeps calling him for rides. Once a successful gourmet chef, Finn's biggest concern now is making his rent, but half the time Callie doesn't remember to pay him. And as she starts to feel better, she leads him on wild goose chases to find a Christmas date for her granddaughter. When Finn meets Sydney, he's quite sure that she's never needed help finding a date. Does Miss Callie have an ulterior motive, or is this just a mission driven by delusions? He's willing to do whatever he can to help fulfill Callie's Christmas wish. He just never expected to be a vital part of it.