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.