Here Derrida is returning his focus to some themes that preoccupied his earlier writings from the '50s through the early '70s--especially the limitations and productivity of phenomenology.
What is new here is a reconsideration of the connections between bodily perception, meaning, and the use of language. Above all, he demonstrably problematizes the rigid hierarchy of literal/theoretical language over metaphorical language. Interestingly, this he reveals this through difficulties in trying to express within phenomenology how perception happens (above all, touch, with it's supposed immediacy): here, literalism constantly breaks down into or tacitly relies upon the metaphorical. The theoretical immediacy of touch is expressed only in the linguistic mediacy of metaphor. But metaphor (trope and word-play generally, too) turns out to be more immediately lived, or rather captures the reader/listener in the living of touch and perception.
At the same time, Derrida is entering into the concerns of Merleau-Ponty and R. Barbaras: the fact that truth and experience happen for and as living beings. The dynamism of life, being alive--again highlighted through touch--is neither wholly immediate nor mediate, but is nevertheless something that must be expressed in any account of truth and experience.
There is far more here than this (including the discussion of Christianity, feminism, Judaism, etc.). As such this book would be best suited for those familiar with Derrida (and the earlier phenomenological tradition).
The opening and closing of this book are deeply personal and literary. There are the typical jokes and impossibly dense passages, too. But overall, its par for the Derrida course, stylistically.