[...] one night they'd had a serious division of views over Berlin. "I know what they ought to do," Grover yelled (he always yelled — at walls, at anything else solid that happened to be around -to let you know it wasn't you he was mad at but something else, something to do with the scaled-up world adults made, remade and lived in without him, some inertia and stubbornness he was too small, except inside himself, to overcome), "exactly what they should do." But when Tim asked what, Grover only said, "Never mind. The thing we argued about isn't important. But now we don't talk; that is important. When I'm home now they let me alone and I let them alone." [...]