Clarisse dies (i think). It could be that, in this world, a girl like Clarisse just can’t exist. She’s incompatible with her surroundings, so she’s not allowed to live. I don’t know all the details of her demise, or is the confusion reconciled by the end of the novel. But I can’t help but think of Clarisse when Granger discusses the thumbprint on his mind left by his grandfather. Even after her disappearance/death, Clarisse continues to affect Montag. She exists because she changed his mind, where as someone like Mildred hardly existed at all.
