Like pretty much all the other reviews said, this is really good and amazing at pullin you into the story. The sister dynamics and various misleads are fascinating to watch and very well played out. I was rooting for everyone but the "victim" (and maybe Ursula, who I found hard to sympathize with). I'd say it's a black comedy with an infinite amount of heart.
Even the intro grew on my, especially the song - can't stop singing the catchiest bits now...