For reliable information, apply to a lawyer, a barber or prostitute. My informant hasn't found out so far who paid the captain.' 'But she will,' said Margaret, her face grave. 'I hope so,' he said with equal gravity
"For reliable information, apply to a lawyer, a barber, or a prostitute," suggests that trustworthy or dependable sources are scarce or unconventional. The narrator admits they haven't discovered who paid the captain yet, implying a mystery or hidden motive behind the captain’s actions.
Margaret believes that eventually, the informant will find out the truth about the payment. Both characters share a serious tone, indicating the importance of uncovering this secret in their context or story, highlighting themes of intrigue and the search for truth.