The Assistant

Time magazine's 'All-Time list of 100 Novels'
Frank Alpine, a drifter fleeing from his past, runs straight into struggling Brooklyn grocer Morris Bober. Seeing a chance to atone for past sins, Frank becomes Bober's assistant and keeps shop when the owner takes ill. But it is Bober's daughter, Helen, who gives Frank a real reason to stay around, even as he begins to steal from the store.
Widely considered as one of the great American-Jewish novels, The Assistant is a classic look at the social and racial divides of a country still in its infancy, and a stunning evocation of the immigrant experience - of cramped circumstances and great expectations.