Unraveling her grandfather's past, Isla stumbles upon a photograph that challenges everything she knows about him. Associated with Nazis, her beloved grandad's untold history compels her to seek the truth. In a story interwoven with forbidden love, secret resistance against tyranny, and an indelible family legacy, "The Rainbow" transports readers back to the heart of World War 2 as it follows Isla's desperate pursuit for answers. Through lost memories and the haze of dementia, can she uncover the sacrifices made for love and justice?