Twenty-two-year-old Olivia has been missing for one day…and counting. She was last seen on CCTV, entering a dead-end alley. And not coming back out again. Julia, the detective heading up the search for Olivia, thinks she knows what to expect. A desperate family, a ticking clock, and long hours away from her husband and daughter. But she has no idea just how close to home this case is going to get.

When Hazel Sharp, daughter of Mirror Lake’s longtime local detective, unexpectedly inherits her childhood home, she’s warily drawn back to the town—and people—she left behind almost a decade earlier. But Hazel’s not the only relic of the past to return: a drought has descended on the region, and as the water level in the lake drops, long-hidden secrets begin to emerge…including evidence that may help finally explain the mystery of her mother’s disappearance.

Ciara and Oliver meet in a supermarket queue in Dublin and start dating the same week COVID-19 reaches Irish shores. When lockdown threatens to keep them apart, Oliver suggests they move in together. Ciara sees a unique opportunity for a relationship to flourish without the scrutiny of family and friends. Oliver sees a chance to hide who - and what - he really is.

Iris and Gabriel have just arrived home from a make-or-break holiday. But a shock awaits them. One of their closest friends, Laure, is in their house. The atmosphere quickly becomes tense as she oversteps again and again: sleeping in their bed, wearing Iris' clothes, even rearranging the furniture. Laure has walked out on her husband—and their good friend—Pierre, over his confession of an affair and a secret child. Iris and Gabriel want to be supportive of their friends, but as Laure's mood becomes increasingly unpredictable, her presence takes its toll.

July 1995. April and Eddie have taken a wrong turn. They’re looking for the small resort town where they plan to spend their honeymoon. When they spot what appears to a lone hitchhiker along the deserted road, they stop to help. But not long after the hitchhiker gets into their car, they see the blood seeping from her jacket and a truck barreling down Atticus Line after them.