Spanning the years 1900 to 1977, The Covenant of Water is set in Kerala, on South India’s Malabar Coast, and follows three generations of a family that suffers a peculiar affliction: in every generation, at least one person dies by drowning—and in Kerala, water is everywhere. At the turn of the century, a twelve-year-old girl from Kerala’s long-existing Christian community, grieving the death of her father, is sent by boat to her wedding, where she will meet her forty-year-old husband for the first time.

Shortly before the Japanese invade, the van Hoorn family throws their famous Sinterklaas party at their tea plantation in West Java. One of their guests, Mattijs, a Dutch pilot, hopes to forge a future in the Dutch East Indies, possibly with the family's daughter Anna, but she is torn between her dreams of Holland and her desire to belong. Meanwhile the housekeeper, Diah, keenly observes the goings-on around the plantation, wondering how much to tell her freedom-fighter brother.

Katelyn smiles around at her husband and friends, gathered to celebrate her 36th birthday in their beautiful home decorated with fairy lights. But the next day Katelyn wakes up shaken and terrified in a hospital bed. She doesn’t remember the sweet taste of birthday cake icing, or how angry her best friend was at midnight, or the terrible things her husband said. She doesn’t remember the party at all. When she asks her husband what happened the night of the party he says "nothing". But her blood runs cold at the way his voice lilts slightly. The way it always does when he is lying.

Psychiatry registrar Doctor Hannah Wright, a country girl with a chaotic history, thought she had seen it all in the emergency room. But that was nothing compared to the psychiatric ward at Menzies Hospital. Hannah must learn on the job in a strained medical system, as she and her fellow trainees deal with the common and the bizarre, the hilarious and the tragic, the treatable and the confronting.

My hand trembles as I stare at the anonymous text. On this sunny Saturday morning, our twin ten-year-old boys were playing in the park just down our tree-lined street. But only one of them has come home… and it’s all my husband’s fault. I race to Leo’s study and demand answers. As his face turns white, I know: one of his affairs has turned deadly. I always smell the unfamiliar perfume on his shirt. I try to pretend we are a happy family, for the sake of the children… but now, my child is in terrible danger.