In 2019, a London teenager, Zac Brettler, mysteriously fell to his death from a luxury apartment building on the banks of the Thames. When his grieving parents began their desperate quest to understand how their son had died, they made a terrible discovery: Zac had been leading a fantasy life, posing as the son of a wealthy Russian oligarch.

In his inimitably gripping and forensic prose, Baillie Gifford Prize winner and New Yorker writer Patrick Radden Keefe follows Zac's parents on a dark journey to find out what brought Zac to the balcony that night , and how a teenager's world of make, believe drew him into the city's terrifying underworld.