When Karen Cartwright is unexpectedly called home to nurse her ailing father, she goes with a heavy heart. The house she grew up in feels haunted by the memory of her father's closely guarded secrets about her beautiful mother Elizabeth's tragic death years before.

As she packs up the house, Karen discovers an old photograph and a stranger's tattered love letter to her mother postmarked from Germany after the war.

During her life, Karen struggled to understand her shy, fearful mother, but now she is realising there was so much more to Elizabeth than she knew. For one thing, her name wasn't even Elizabeth, and her harrowing story begins long before Karen was born.

It's 1941 in Nazi-occupied Berlin, and a young Jewish woman called Liese is being forced to wear a yellow star...