you first have to find the 5 notes. It's all inside the house you just have to find them. The note has symbols same as the ones in your room's clock. Follow all 5 and you'll get the clock's arm as a key. Be sure to click on the arm. Unlock the chest in your room and it'll drop a note (don't read it. It's just the BEE MOVIE script lol) and another key. Use the key in the attic (Janet's room) and you'll get a pipe artifact which you can equip and the map to the tomb. That's it