The tall man

A tall dark-haired man with sharp features is following the investigators. He made his first appearance after Dr Bartlett returned from Herefordshire.

First he turned up in Dr Bartlett's street, pretending to be a taxi driver, looking for the Doctor's house.

Then he appeared at Victoria barracks with a parcel for Captain Withers. The parcel contained a house brick - and was apparently delivered purely to identify Withers' billet.

Thirdly he intercepted Andrew Saunders during a taxi ride and theatened the curator with violence if he and his friends didn't 'forget all about this business'. he stayed in the sahdoes throughout, so Saunders never got a good look at his face.

The tall man is English, working class and apparently violent. He wears a long dark coat over a cheap suit, drives a non-descript black car and has unkempt, greasy black hair.

In addition to these sightings, one of the suspects in the murder of Dr Lionel Trollope fits his description.