For the last 20 years, Summer has lived a solitary life, focusing on her career as a vet and trying not to think of the past. Every year she escapes for a few weeks to beautiful Greek islands, losing herself in photography and wreck diving. When the junk room of her clifftop cottage is cleared to accommodate a carer for her father, Summer stumbles across the belongings of her great-grandmother, Gertie Smith. She finds a WWI nurse's uniform, a soldier's blanket and a recording of Gertie's memoirs.

Sent away to convent school at the age of six, Irini McGuire has never really known her celebrated archaeologist mother, Bridget, who lives on the paradise island of Santorini. So, when Irini receives news that Bridget has been injured at a dig and is in coma she knows it is time to return to the island of her birth. Discovering her mother's notes, and driven by rumours that her mother's injury was no accident, Irini starts to reveal the dark secrets behind her family's separation. Can she unearth the truth about her parents and her past before it is too late?

On the beautiful beaches of Crete, an old woman is handing out scraps of paper. Sofia, eighty-five years old, unable to speak, is desperate to find a daughter she has never known. After a tragic childhood in Athens and a soaring career as a singer, the brutal treatment of the man she loved by a tyrannical regime forced her to give up her daughter mere days after her birth. Now she longs to be reunited with her child before it's too late. Meanwhile in London, Zoe is searching too. In the months since the disappearance of her teenage daughter, Zoe's life has crumbled apart.

On the Greek island of Castellorizo, young Sofía must put her big dreams on hold to support her older sister Maria with her large family. But World War II is looming and while the idyllic island may seem far from harm at first, there are unspeakable dangers on the horizon—perils that will change the sisters' lives forever. Devastated by her divorce and the death of her dear mum, Olivia seeks solace on Castellorizo. Her Granny Sofía fled the beautiful Greek island during the war, but Olivia knows little else about her family's history.

Maia D’Aplièse and her five sisters gather together at their childhood home–a fabulous, secluded castle situated on the shores of Lake Geneva–having been told that their beloved adoptive father, the elusive billionaire they call Pa Salt, has died. Each of them is handed a tantalising clue to their true heritage–a clue which takes Maia across the world to a crumbling mansion in Rio de Janeiro in Brazil . . .