Something is dead inside my house

[shadow.]

Yesterday a terrible smell began to permeate throughout my house. It got even worse today and continued its sprawl. I've looked in the basement, the crawlspace underneath the house and in the attic. No luck.

It is about to be unbearable to live in here, although fortunately my bedroom and the outer rooms (kitchen, dining room, den) remain uninfected. I, however, fully expect the smell to beseige those rooms. It is definetly the smell of death.

Are there professionals or some sort of service that will find the offender for me? Any tips as to a temporary solution (besides Febreeze) until this creature is found?

Thanks for any help.