On top of Primrose Hill, Lizzie Williams makes a wish…and doesn’t realise someone is listening. Lizzie and Charles have been married for years. Childhood sweethearts and best friends, they know each other better than they know themselves. However, as they enter their thirties trying for a family begins to consume their life and cracks begin to show as Lizzie comes face to face with a problem she can’t fix. In a desperate moment, she wishes she could take it all back…And then she wakes up at nineteen again.Instead of marrying Charles, Lizzie leaves him.Instead of 'Williams' after her name, Lizzie stays a 'Cartwright'.But some things can't be hidden forever. Thirteen years later, fate intervenes and suddenly Charles is back in Lizzie's life again, confused and intrigued as to why the girl he loved so many years ago seems to be avoiding him at all costs. As the pair get closer and closer, Charles begins to remember things he can't explain whilst Lizzie struggles to keep the only person she has ever loved at arm's-length.Lizzie has spent her entire new life keeping secrets and thinking she did the right thing but secrets leave scars and maybe this time, she didn't solve a problem, she simply created more of them.