Interstate is a collection of lyrical poems in four sections that concentrate thematically on animals, love and sex, compassion, and loss. A unifying elegiac conceit, even in the more ecstatic and humorous poems, betrays the bittersweet nature of the book's muse. Alternating between free and formal verse, the poems contain a lyrical tension in which their "broken music" evokes metaphysical paradoxes, romantic humor, and the "dark sounds" that effect what Garcia Lorca called "the power everyone feels" in the mystery of duende "but no philosopher can explain."