Tilly use to love Maris. That is, until she watched her brother drown. Now it only serves as a reminder of what she's lost. She thought that the town was part of a past she longs to forget. But when her grandma calls one night, begging her to come back, she can't find it in her to say no. The longer she stays in Maris, the more she learns that the swamp isn't ready to let her go.

After over a decade away, Rebecca Sunderland returns home to Marais, Louisiana, in an effort to heal her grieving mother. Becca works for her father as a means to continue her research as a botanist and, in doing so, meets disgraced scientist Alec Holland. Holland, convinced Becca's father is up to no good in the swamp, enlists Becca's help to find out the truth. Little did either

Abby thought that she could deal with the horrible discovery she and Alec had made in the swamp. Yet after days without sleep she has to realise that she cannot escape the horrible images or the heart-wrenching questions that come with them. / Set after the series finale with massive spoilers for episode 9.

After Alec saved her from the darkness at the end of episode 4, Abby spends the night in the swamp, where she is met with a familiar face.