The Sparrow
Members of a Jesuit-led expedition to another planet face the ultimate test of their wisdom and endurance when they encounter two intelligent alien species, one of which uses the other as both servants and prey. This well-written novel and its sequel, Children of God, raise profound questions about the spiritual meaning of suffering and the unforeseen consequences of our actions.
Source: http://www.amazon.com/exec/obidos/ASIN/0449912558/winningwriter-20