My brother could not tell him.

Afterwards he found that the vague feeling of alarm had spread to
the clients of the underground railway, and that the Sunday
excursionists began to return from all over the South-Western
"lung"--Barnes, Wimbledon, Richmond Park, Kew, and so forth--at
unnaturally early hours; but not a soul had anything more than vague
hearsay to tell of.  Everyone connected with the terminus seemed
ill-tempered.