This new work by eminent theologian Dermot Lane is an informed report of progress in the Catholic Church on the importance of dialogue with other religions. The author shows that interreligious dialogue is no longer an option, but is rather part of what it means to be Catholic in the twenty-first century. Adopting a pneumatological approach to dialogue with other religions, Lane shows how a theology of the Holy Spirit is the key to unlocking the riches of other religions.