The truth has a way of revealing itself… and some secrets have waited decades to be uncovered.

As Zeynep struggles with the hardest decision of her marriage, devastating news arrives from Istanbul: her grandmother, Şahika, has suffered a stroke and is in critical condition. Rushing from New York to Turkey, Zeynep learns of her grandmother’s final, mysterious wish: she must find “the key.”

Unaware of any key or what it might unlock, Zeynep is drawn into Şahika’s enigmatic past, guided only by her grandmother’s red leather-bound diary. There, she uncovers an unforgettable love that began in 1950s Istanbul and spans two generations, along with secrets that bind the two women and threaten to change everything she thought she knew about her family.

When the key is finally found, Zeynep will unlock a past filled with love, betrayal, and hidden truths—and write the ending to a story that has remained secret for decades.