Centuries from now, in a post-climate change dying boreal forest of what used to be northern Canada, Kyo, a young acolyte called to service in the Exodus, discovers a diary that may provide her with the answers to her yearning for Earth's past -- to the Age of Water, when the "Water Twins" destroyed humanity in hatred -- events that have plagued her nightly in dreams. Looking for answers to this holocaust -- and disturbed by her macabre longing for connection to the Water Twins -- Kyo is led to the diary of a limnologist from the time just prior to the destruction. This gritty memoir describes a near-future Toronto in the grips of severe water scarcity during a time when China owns the USA and the USA owns Canada. The diary spans a twenty-year period in the mid-twenty-first century of 33-year-old Lynna, a single mother who works in Toronto for CanadaCorp, an international utility that controls everything about water, and who witnesses disturbing events that she doesn't realize will soon lead to humanity's demise. A Diary in the Age of Water follows the climate-induced journey of Earth and humanity through four generations of women, each with a unique relationship to water. The novel explores identify and our concept of what is "normal" -- as a nation and an individual -- in a world that is rapidly and incomprehensibly changing.