A solid atmospheric tale about the psychological effects on an older couple running a boarding house in era of the Rippers crimes.
They have fallen on hard times when a new lodger appears on their doorstep as if he were a godsend. Peculiar though he may seem, they welcome him and his much needed money.
But the bliss at having stayed off financial problems is short lived as their lodger's strange habits and behaviours are cause for suspicion when they consistently seem to occur at the same time as the gruesome crimes of the so called Avenger...

For a modern audience the pace might seem a bit slow, but nothing in this story is out of place or there just to draw things out. Highly recommendable