Ellen posted her letter. She dropped it into the box thoughtfully, and thoughtfully returned to the flat. She looked over her shoulder, but Constable Plimmer was out of sight.

Peaceful Battersea began to vex Constable Plimmer. To a man crossed in love, action is the one anodyne; and Battersea gave no scope for action. He dreamed now of the old Whitechapel days as a man dreams of the joys of his childhood. He reflected bitterly that a fellow never knows when he is well off in this world. Any one of those myriad drunk and disorderlies would have been as balm to him now. He was like a man who has run through a fortune and in poverty eats the bread of regret. Amazedly he recollected that in those happy days he had grumbled at his lot. He remembered confiding to a friend in the station-house, as he rubbed with liniment the spot on his right shin where the well-shod foot of a joyous costermonger had got home, that this sort of thing—meaning militant costermongers—was 'a bit too thick'. A bit too thick! Why, he would pay one to kick him now. And as for the three loyal friends of the would-be wife-murderer who had broken his nose, if he saw them coming round the corner he would welcome them as brothers.

And Battersea Park Road dozed on—calm, intellectual, law-abiding.

A friend of his told him that there had once been a murder in one of these flats. He did not believe it. If any of these white-corpuscled clams ever swatted a fly, it was much as they could do. The thing was ridiculous on the face of it. If they were capable of murder, they would have murdered Alf Brooks.

He stood in the road, and looked up at the placid buildings resentfully.

'Grr-rr-rr!' he growled, and kicked the side-walk.

And, even as he spoke, on the balcony of a second-floor flat there appeared a woman, an elderly, sharp-faced woman, who waved her arms and screamed, 'Policeman! Officer! Come up here! Come up here at once!'

Up the stone stairs went Constable Plimmer at the run. His mind was alert and questioning. Murder? Hardly murder, perhaps. If it had been that, the woman would have said so. She did not look the sort of woman who would be reticent about a thing like that. Well, anyway, it was something; and Edward Plimmer had been long enough in Battersea to be thankful for small favours. An intoxicated husband would be better than nothing. At least he would be something that a fellow could get his hands on to and throw about a bit.

The sharp-faced woman was waiting for him at the door. He followed her into the flat.

'What is it, ma'am?'