HallieMae, I have the same identical problem, but the closed captioning fixes all for me.
I found it not at all clear. I cannot help but think if the writers were not so hell bent on making us think the murderer could be any one of half a dozen different characters, the unfolding of the plot would have made more sense. Instead, I became very confused as to who was blackmailing whom and why; how did so many look so young after, wasn't it 20 years?, had passed. Why did the gal who visited her sister who was in a coma live in smallish Oxford and never, ever run into that guy, Eddie? If Poppy had seen the original murder of the young womanizer, or at the least help hide the body, why was she not murdered until 20 years later? Color me utterly confused. But the scenes are always, or nearly always, marvelous; as are the actors.