They must not enter No.412.They will be blown to pieces.
Stop them! I shall not warn you twice!" Somehow, Winter was impelled to obey.

The center door was already yielding, but he rushed forward and told the party which meant to enter at that point to abandon it, and reinforce their comrades.

A number of detectives and police were already inside the dark hallways of Nos.

410 and 414 when the very walls trembled under the shock of a violent explosion in No.

412, which was quickly followed by three others.
A tongue of flame darted instantly to a height of many feet above the topmost storey, showing that the series of explosions had not only destroyed the whole rear section of the house, and thus given the fire fresh fuel and plenty of space but there could be no reasonable doubt that the bombs, if bombs they were, had themselves been filled with some highly inflammable substance.