Isabel learns of her ex-fiance's return to London when the roguish young man tries to win the job of supplying fireworks for Queen Victoria's Diamond Jubilee celebration. This is a privilege which is passed down through Isabel's family, as they have been the supplier of fireworks to the royal family for centuries! The battle lines are drawn as the pair tries to outwit and outdo each other to see who will light up the night. But even as the fireworks go off, they find themselves being drawn to one another in a way even more explosive.