The Body in Question by Jill Cement
This book is short and emotionally intense (as many of my favorites are–either that or epically sprawling). Two people, identified only by their numbers (at first), are on a sequestered jury for a murder trial (committed, incidentally, by one of a pair of twins, although which one actually did it is a primary question). He is an anatomy professor; she is a married photographer. It’s a jury of only six, with the others identified just by vaguely descriptive nicknames (cornrows; the church lady; the alternate).
The, after the verdict, there’s a whole second section of fallout in their real lives with names, and t’s dark and tense and deeply ironic, with exploration of life, death, and inhabiting a body. In fact the drama is so perfect that it verges on unbelievable, but by that point I’m not sure true realism is what I want; it’s satisfying like this.
Bonus points for accurate legal trappings.