Schisms and reunions -- Part one: the nineteenth century. Beginnings -- Prophetic voices -- Oxford -- Even at the eleventh hour -- Unity in the church -- Roma locuta est -- Part two: the twentieth century. Nineteen-ten -- Life and work -- From saint Pius X to Pius XI -- Malines -- Una sancta -- Spiritual ecumenism -- The Anglo-saxon approach -- 17 route de Malagnou -- Hopes -- Byzantium and Moscow -- The final question -- Towards a council