Two agents—and former lovers—must work together to combat international cyberattacks threatening the UK while also confronting the buried secrets of their destructive relationship.

In Shanghai in 1937, a journalist meets and falls for a woman who refuses to tell him her name, referring to herself only as "Ghost". She disappears, and his efforts to find her lead the journalist to clear up an old, unsolved murder case.

When her sister is accused of a brutal murder, a former D.A. tries to clear her name and finds herself thrust into a dangerous mystery of infidelity and betrayal that may lead all the way to one of the city's most powerful men.