Born ten months apart, July and September are thick as thieves. Yet, older sister September dominates and controls July, and their dynamic is clearly a concern to their mum, Sheela.

When September is suspended from their school and July is left to fend for herself, July begins to assert her own independence. Following an unseen incident, the trio move to an old family holiday home in Ireland. There, July finds that her bond with September is shifting in ways she cannot entirely understand, and a series of surreal encounters test the limits of their shared experience.