As the tangled international web of lies and deceit unravels, an old nemesis of the detectives makes his appearance, and his motivation is revenge...against the Russian oligarchy and not the detectives.
In a subplot, Castilblanco's struggle to adopt his cousin's children, begun in Family Affairs, continues...as do his meetings with his guru to become a Buddhist.
(Interpol agent Bastiann van Coevorden makes another cameo appearance here. He's a main character in Rembrandt's Angel.)