The novel's main protagonist, Lieutenant (later Major) John Adam (a semi-autobiographical foil for McDougall), is an efficient soldier and leader, who nevertheless finds "the vulture fear" inhabiting his soul after the execution of the Italians. Bound to protect and lead his men as they march through Italy, from Ortona to the Hitler Line near Monte Cassino, Adam finds himself struggling to maintain the composure fitting a commander, as an inner "horror" gnaws at his conscience (Adam's reflections occasionally resemble those of Marlow in Joseph Conrad's "Heart of Darkness").