Marina Freixa always knew there was something dark and unspoken about her family.

Her mother had grown up under Spain's decades-long dictatorship, which ended in 1975, but the details of her childhood were hazy.

Then everything changed one Christmas a decade ago - when Marina was about 20.

That winter's evening around the table, with a cloud of cigarette smoke suspended in the air and wine glasses drained, Marina's mother, Mariona Roca Tort, began to speak.

"My parents reported me to the authorities," Mariona told them. "They put me in a reformatory when I was 17."