Lost in Florence, Filipina writer Isla Mendoza stumbles upon a mysterious bookshop on Via Lullina, a street that isn't supposed to exist. Within its walls, she discovers an old book filled with enchanting love letters—and one addressed to her. The letter is from Luca Rossi, a man Isla has never met. Too curious to let it go, she tracks him down, only to discover a grumpy Italian chef who thinks she is out of her mind. Destiny? Foretold by a magical letter? With love as the plot twist? No, grazie. Drawn to the book for their own reasons, Isla and Luca begin an investigation. The more the pair try to resist, the more the book writes. What will happen when they reach the last page?