What further involvement does Raymond ask of Meursault as this chapter opens?

At the start of Chapter Fice, Raymond calls Meursault at his office which annoys Meursault because his boss does not like them to receive personal calls. Raymond tells him that they are invited to a beach house of a friend of his and that he can bring Marie. He also says that a pack of Arabs, one of which is his former girlfriend's brother, had been following him.