The Groundsmen delves into the fractured lives of a family blemished by a darkly disturbing past. The secrets kept hidden over multiple generations taint them all and as events spiral out of control in a cycle of violence, none of them will escape. The narrative is told from the perspective of five individual family members: Louis is trapped under the dark shadow of his past with Toby. Cally retreats to a world of myth and seeks a salvation that eludes her. Andi is caught in a degenerate relationship of dependency and control. Cassie is turning into a dog and burying the wreckage of all their lives in the garden. Over them all looms the dark presence of the Groundsman's hut.