At first, Nadeeka thinks she knows exactly what is wrong.
Her partner, Jamie Golding, has started behaving differently. He is increasingly secretive with his phone. His explanations for coming home late do not quite fit. The warmth in their relationship appears to be fading.
For somebody else, those changes might be unsettling.
For Nadeeka, they are terrifyingly familiar.
Her previous marriage to Scott was damaged by his repeated infidelity, leaving her unusually alert to the small behavioural changes that can signal betrayal. She has rebuilt her life since the divorce, raising her daughters Maya and Nish and eventually allowing herself to trust Jamie.
Jamie seems different.
Then he starts behaving like Scott did.
Nadeeka therefore reaches what appears to be the rational conclusion available from the evidence she has: Jamie is cheating.
Mackintosh’s central trick is not simply to prove Nadeeka wrong.
It is to demonstrate how dangerous apparently sensible conclusions can become when they are built from incomplete information.
The entire novel repeatedly asks the same uncomfortable question in different forms:
How much of another person do we actually know?
That question applies to lovers.
It applies to former spouses.
It applies to colleagues.
And eventually, much more disturbingly, it applies to police officers and the institutions society depends upon.