In a quiet Sydney suburb, soon-to-be-married Sonny Day sets off on his bike to catch the train to work. He never makes it to the station. After his fiancée Chrys reports him missing, DI India Hargreaves launches a low-key investigation.

Weeks later, a man's body is found, mutilated and buried, on a nearby building site, but it's not Sonny, and with no solid leads, both investigations stall...until a letter arrives from Sonny, claiming he's met someone else.

Chrys insists Sonny wrote it under duress. She convinces India to investigate further, beginning with the photograph that came with the letter and ending in Scotland and the discovery of more mysterious deaths. But two questions remain unanswered.

Whose body was buried on the building site? And where is Sonny Day?