1. Prentice, an encyclopedia salesman, telephoned Hall and arranged to visit her at her apartment to show her his firm's latest volumes. When he entered the apartment building, owned by Newman, Prentice found the staircase lighting was out of order. He attempted to climb the stairs in the dark and fell on a loose step, breaking his leg. Hall knew of the faulty light and the loose step but had not thought to warn Prentice. No one had told Newman of either defect.

What claim does Prentice have against either Hall or Newman?