If you want a detailed plot summary with lots of spoilers see https://en.wikipedia.org/wiki/The_Brass_Verdict. I enjoyed the story very much, lots of neat trial work. The plot was perhaps a bit contrived but no matter. I like Mickey Haller’s character. Harry Bosch also plays a role in the novel and it turns out he has more in common with Haller than one would have expected, both literally and figuratively.
I had no idea what a “brass verdict” but when googled in the urban dictionary it does make sense.