Letters from Marusia is the chronicle of a workers' strike in a small Chilean town in 1907. The foreman of the English- owned Marusia Mining Co. Ltd. has been killed by a hot headed worker. The policy of intimidation thereafter followed by the company unifies the miners. Realising for the first time their own power and strength, they form a strike committee - even their wives become involved. When the strike persists and the company's strategy of repression does not succeed, the army is called in to suppress by brute force every sign of independence in Marusia.