Tamar: A Novel of Espionage, Passion, and Betrayal is a young-adult novel by Mal Peet, published by Walker Books in 2005. Within a 1995 frame story, where a 15-year-old girl inherits papers and other mementos from her deceased grandfather, it is set in the occupied Netherlands near the end of the Second World War; there it features two British-trained Dutch agents and the resistance to German occupation of the Netherlands. The novel interweaves past and present to show the lasting effects of war and the passions it arouses.