The Heights is a tall, slender apartment building among warehouses in London. Its roof terrace is so discreet, you wouldn’t know it existed if you weren’t standing at the window of the flat directly opposite. But you are. And that’s when you see a man up there—a man you’d recognize anywhere. He may be older now, but it’s definitely him.

Arriving on the windswept Ile de Ré, Tabby Dewhurst is unable to even afford a room for the night. Overhearing a villager repeating the access code to her front door, she lets herself into the house, and so she enters the strange, hidden world of Emmie, whose sudden offer of friendship is at odds with her obsession with privacy. Tabby begins to form suspicions about Emmie, suspicions that lead her to a scandal with shattering consequences.

It all happens so quickly. One day you’re living the dream, commuting to work by ferry with your charismatic neighbor Kit in the seat beside you. The next, Kit hasn’t turned up for the boat and his wife, Melia, has reported him missing. When you get off at your stop, the police are waiting. Another passenger saw you and Kit arguing on the boat home the night before, and the police say that you had a reason to want him dead. You protest. You and Kit are friends - ask Melia, she’ll vouch for you. And who exactly is this other passenger pointing the finger?

When Fiona Lawson comes home to find strangers moving into her house, she's sure there's been a mistake. She and her estranged husband, Bram, have a modern coparenting arrangement: bird's nest custody, where each parent spends a few nights a week with their two sons at the prized family home to maintain stability for their children. But the system built to protect their family ends up putting them in terrible jeopardy. In a domino effect of crimes and misdemeanors, the nest comes tumbling down.

Celebrating her forty-fifth birthday at her local pub, popular podcaster Alix Summer crosses paths with an unassuming woman called Josie Fair. Josie, it turns out, is also celebrating her forty-fifth birthday. They are, in fact, birthday twins. A few days later, Alix and Josie bump into each other again, this time outside Alix’s children’s school. Josie has been listening to Alix’s podcasts and thinks she might be an interesting subject for her series. She is, she tells Alix, on the cusp of great changes in her life.