Figure out who your Project Sponsor is and go talk to him or her. It's never you and usually not your boss although she/he thinks they are. Ask who's idea this was and why is it important to the business. If you can't figure out who the Project Sponsor is, stop working on the project. The Sponsor will find you if there is one. If you have multiple Project Sponsors, figure out who is your best ally and strategize to nurture that relationship to cope with the confusion of multiple sponsors (yuck).