The neighbor was Estelle’s lover and neighbor across the landing; he’s deceased in the novel’s present. Estelle never shares his name, but they were both avid readers and eventually, they began swapping books and notes in the elevator. Ultimately, the neighbor gave Estelle a key to his apartment, but Estelle believes he would’ve liked it if she visited him. She never did, but when he died, she kept the key. In the present, Estelle gives the neighbor’s key to the bank robber so she can go hide in the neighbor’s old apartment to evade the police.