Mystery House / Kathleen Norris

In the palm of her hand lay the diamond – enormous, priceless, deadly.

When Page Hazeltyne came to Mystery House as the companion to eccentric Mrs Prendergast, she was enmeshed in a baffling intrigue. The precious Ked Anna diamond had disappeared. Page discovered who had the diamond, but she dared not tell. Among the strange, greed-ridden residents of Mystery House, there were those who would murder to possess the gem. Page had to sort out the friends from the enemies — for one of the guests in that fearsome place was the man she loved.