Lachlan Garrow built his gleaming glass store on Princes Street directly across the road from Abernethy's, Edinburgh's oldest family department store, and he has spent two years trying to put it out of business. Then he is filmed telling a six-year-old girl that Christmas is a con, and overnight the whole country calls him the Scrooge of Princes Street.
Noelle Abernethy makes the famous Christmas windows, owes a loan she cannot pay, and has never liked Lachlan Garrow. But when a photographer catches the two rivals nose to nose in the snow outside a Christmas gala, Scotland decides it is watching a love story.
So they make a deal. Until the last bell at Hogmanay, they will play the couple everyone wants them to be. He saves his reputation before his board can remove him. She saves the store her family has run for five generations. They write the rules on the back of a receipt. No kissing unless absolutely necessary. No staying over. No lies between them. And nobody falls in love.
Then a storm buries her grandmother's house in the Highlands, and Lachlan is snowed in with Noelle's noisy, curious family and only one bed. The kisses are no longer for the cameras. The man who never takes a day off at Christmas starts to remember what he lost, and Noelle starts to see the person behind the ice.
But Lachlan has been lying since the first night. He knows exactly whose granddaughter Noelle is, and why he walked into her office. If she finds out the truth, she could lose her store, her family's good name and the man she was never supposed to love.
When the rules are broken, can a romance that started as a lie become the truest thing either of them has ever had?