HBO’s new documentary “The Inventor: Out for Blood in Silicon Valley” chronicles the rise and fall of Elizabeth HolmesSilicon Valley entrepreneur whose company, Theranos,claimed to revolutionize the world of blood testing. Spurred by an intense desire for wealth and fame, Holmes devised a way to carry out complex blood tests — the sorts that usually require an uncomfortable venous draw — with only a drop of blood obtained through a finger prick. The problem she and her company encountered, though, was that they simply couldn’t get the process to work. Terrified of failure and obsessed with her own legend, Holmes lied and connived to keep Theranos afloat, deliberately misrepresenting the abilities of her company. “The Inventor” dutifully tracks these events with straightforward documentary reporting, but it fails to fully delve into the fascinating character of Elizabeth Holmes or her web of deceit, resulting in a film that lacks intrigue and coherence.