Behrouz Boochani’s No Friend but the Mountains (2018) is the first major literary work to emerge from Australia’s offshore refugee detention regime in the Pacific. This essay examines Boochani’s landmark poetic-philosophical memoir for the way it exposes the systematic torture inside Manus Prison, Papua New Guinea. If, in the 1990s, the field of diaspora studies was reinvigorated by the apparently accelerated movement of people, money, and products, what purchase is a diasporic framework in the face of proliferating regimes of immobility? The chapter proceeds by thinking through three tropes common to diasporic narratives: first is the account of oppression that forces flight from the homeland; second are practical and ethical questions of hospitality/hostility, inclusion/exclusion, in the land of arrival; and third is the politics of collective identity in relation to the homeland. In short, how might we think of diaspora with its seeming opposite, detention?