An intriguing mystery from this popular author

James Markham jilts his fiancée for a woman about whom he appears to know very little.

Callum Firbank has always been evasive about his childhood, and his wife realises she knows little about her husband's upbringing or family.

Jill Irving has everything she could wish for, but she, too, has secrets in her past.

What links these three very different people, and who is the mysterious stranger whose appearance in their lives seems to cause such terror?