Martha Serpas's Double Effect reimagines Saint Thomas Aquinas's doctrine of that name, which governs whether an action is morally permissible despite a foreseeable evil result. In lush verse pointed by Cajun language, these poems measure the good that can result from destructive situations, encompassing ecological devastation, maternal deprivation, spiritual poverty, and mania. Time in this collection is kept by the feast days, hurricanes, celebrations, accidents, and rescues along southern Louisiana's disappearing bayous and eroding coasts. In the end, the question remains: Is there a good that can redeem suffering and loss?