Where is he?

When things get quiet around here it usually makes me a little suspicious of what is going on. Well, today there was a brief moment of silence so off I went to investigate. I found the older two on the computer playing a game and for the life of me, I couldn't find Jacob (even with his bright yellow shirt on). Panic set in for a little bit and then I heard a little giggle from the bookshelf. I think I am in for a lot of mischief from this one.