Trying to escape her broken past, Sarah O’Neill is building a new life on the fringes of a backwood rural town with her young son Chris. A terrifying encounter with a mysterious neighbour shatters her fragile security, throwing Sarah into a spiralling nightmare of paranoia and mistrust, as she tries to uncover if the disturbing changes in her little boy are connected to an ominous sinkhole buried deep in the forest that borders their home.
| Actor | Role |
|---|---|
 Seána KerslakeSarah O'Neill | Sarah O'Neill |
 James Quinn MarkeyChris O'Neill | Chris O'Neill |
 James CosmoDes Brady | Des Brady |
 Kati OutinenNoreen Brady | Noreen Brady |
 Simone KirbyLouise Caul | Louise Caul |
 Steve WallRob Caul | Rob Caul |
 David CrowleyTeacher | Teacher |
 Eoin MackenJay Caul | Jay Caul |
| SSarah HanlyLil Jones | Lil Jones |
 Andrew BennettDoctor | Doctor |
| JJohn QuinnDetective | Detective |
| MMiro Lopperi"It" | "It" |
 Alain Eloy"it" (voice) | "it" (voice) |
 Helena Coppejans"it" (voice) | "it" (voice) |
| GGregory Praet"it" (voice) | "it" (voice) |
 Karim Barras"it" (voice) | "it" (voice) |
| KKobe Truijens"it" (voice) | "it" (voice) |