It’s the hottest day of the 1976 heatwave and there’s not a breath of fresh air in the labour ward at Lincoln County Hospital. Michelle is having her fourth child, a girl, while beloved husband Dean is sipping a cold pint in the pub. Their little house is already bursting at the seams, but Michelle is sure they’ll find a way to stretch their budget and continue life as a blissfully chaotic happy family. They name their new baby Donna.

Harry Boyd, a hard-bitten refugee from failure in Toronto television, has returned to a small radio station in the Canadian North. There, in Yellowknife, in the summer of 1975, he falls in love with a voice on air, though the real woman, Dido Paris, is both a surprise and even more than he imagined. Dido and Harry are part of the cast of eccentric, utterly loveable characters who form an unlikely group at the station. Their loves and longings, their rivalries and entanglements, the stories of their pasts and what brought each of them to the North form the center.

Winnifred "Win" McNulty has always been wildly independent. Not one to be coddled for her limb difference, Win has spent most of her life trying to prove that she can do it all on her own. And, with some minor adjustments, she's done just fine. That is until she has a one-night stand with the incredibly charming Bo, a perfect stranger. And that one night changes everything. While Bo is surprisingly elated to step up to the plate, Win finds herself unsure of whether she can handle this new challenge on her own or if she'll need a helping hand.

One summer morning, twelve-year-old Edward Adler, his beloved older brother, his parents, and 183 other passengers board a flight in Newark headed for Los Angeles. Among them are a Wall Street wunderkind, a young woman coming to terms with an unexpected pregnancy, an injured veteran returning from Afghanistan, a business tycoon, and a free-spirited woman running away from her controlling husband. Halfway across the country, the plane crashes. Edward is the sole survivor.

Milly, Aubrey, and Jonah Story are cousins, but they barely know each another, and they've never even met their grandmother. Rich and reclusive, she disinherited their parents before they were born. So when they each receive a letter inviting them to work at her island resort for the summer, they're surprised...and curious.