10 APRIL 1959, Page 41

The Interloper. By Gwendoline Butler. (Bles, 12s. 6d.) A tenement

house near London Docks: an American historian (female, young) haunted by what might be a poltergeist; and two school- , girls with what seems a touch of the sinister about them. Tension slackens towards end, but out- standing for Southwark background and atmo- sphere of mystery and unease.