Yahoo has had six CEOs in five years: Marissa, Ross Levinsohn, Scott Thompson, Tim Morse, Carol Bartz, and Jerry Yang. Obviously, somebody wants the CEO job for themselves, and has made sure that No One Else Can Have It Until They Return.
But who could it be? Who could be so powerful, and so evil? Well, it's California, and Yahoo is pretty much an entertainment company now, so my bet would be a Hollywood producer of some kind- wait a minute.
Who was the chief before that crazy run of revolving CEOs? Terry Semel. Who spent 24 years at Warner Bros, backed the first Batman flick and The Matrix trilogy, and was chairman and co-CEO before he left for...yeah...Yahoo. He spent six years at Yahoo, and then they booted him. Seems like there's a media wizard out there who wants a comeback.
So what's an incoming CEO to do? Marissa, I'm sorry - but I think you're going to have to find Terry Semel's horcruxes and destroy them. Start with Matrix: Reloaded.