What is an example of foreshadowing in the book 'Chasing Vermeer'?

In "Chasing Vermeer," a key example of foreshadowing is when Petra and Calder find an unexpected piece of information about the missing Vermeer painting in the newspaper, hinting at a connection to a larger mystery before it is fully revealed later in the story. This subtle clue plants a seed in the reader's mind about the significance of the painting and sets the stage for the unfolding events.