Newly widowed Phyllida returns from India to visit her absent-minded father, Professor Woodbridge, only to find the house locked up and deserted. Phyllida learns that he left town four months ago having dismissed the staff, telling them he was leaving for a prolonged holiday. After some further investigation, it appears that her father has vanished. As Phyllida investigates the disappearance of her missing father, she is faced with secrets and revelations she could never have been prepared for....