seven o’clock
`` Then , '' continued Innes , `` there is something else which you should know . I heard to-day from a garage , with which Mr. Harley does business , that he hired a racing car last night . He has often used it before . It met him half-way along Pall Mall at seven o'clock , and he drove away in it in the direction of Trafalgar Square . '' `` Alone ? '' `` Yes , unfortunately . '' `` Toward Trafalgar Square , '' murmured Wessex .