Case of the Sleepwalker's Niece, The (Perry Mason, 8)

Who killed Philip Rease? Peter Kent was known to be a sleepwalker and a bloodstained knife was found under his pillow. There were people who would like to see Peter Kent out of the way, but would they frame him for murder? And would that explain the reason for Rease's death? It was another case full of traps for Perry Mason.