Budapest's dark history finally catches up with Detective Balthazar Kovacs in the final instalment in Adam LeBor's Hungarian crime trilogy.

Budapest, January 2016. The Danube is grey and half-frozen, and the city seems to have gone into hibernation. But not Detective Balthazar Kovacs. Elad Harrari, a young Israeli historian, has disappeared. There's no sign of violence but something feels very wrong.

Harrari was working in the city's Jewish Museum, investigating the fate of t ...