Heidegger's being and Time is often cited as one of the most important philosophical works of the last hundred years. Divided into two divisions, the book's Division One has had immense influence, the fortunes of its Division Two, on the other hand, have been much more turbulent. Within the Continental tradition, which Being and Time has so powerfully shaped, Division Two is often seen as committed to notions of identity and selfhood that we have learned, partly by reading Division One, to abandon. But the reception of Heidegger within the analytic tradition exemplifies an even more striking ambivalence. Division Two is made up of a web of interwoven themes articulated using a collection of puzzling concepts: being-towards-death, the call of conscience, resolution, anxiety, guilt, nullity, being-a-whole, temporality, etc. Each of these concepts poses significant interpretive difficulties.