He hangs around and makes a nuisance of himself for a couple of days until he finally recognizes, and is recognized by, Abraham Sinkov. Sinkov is a top American cryptanalyst; he helped Schoen break Indigo. He and Waterhouse have crossed paths a few times, and though they aren’t friends, per se, their minds work the same way. This makes them brothers in a weird family that has only a few hundred members, scattered about the world. In a way, it is a clearance that is rarer, harder to come by, and more mysterious than Ultra Mega. Sinkov writes him a new set of papers, giving him a clearance that is very high, but not so high that he can’t reveal it.