Tigerlily's Orchids — Ruth Rendell

When Stuart Font decides to throw a house-warming party in his new flat he invites everyone in his building. The party will be one everyone remembers. But not for the right reasons....

Living opposite, in reclusive isolation, is a young, beautiful Asian woman, christened Tigerlily by Stuart. As though from some strange urban fairytale, she emerges to exert a terrible spell on the occupants of Lichfield House.