In the last month, it seems that London is not so safe to live in, at least not for bankers and private accountants. Namely, in the previous month, the city was shaken by a series of murders of these very people, and yes, there is a reason for that which is not justified in any way.
Detectives Lora and Jacob, who are investigating this case, discover that the murders are related to the mafia because one of their favorite members has been sentenced to a long year in prison for tax evasion. They want to gather all the evidence for that, and that includes eliminating the bankers and accountants who witnessed those suspicious transactions. But, the mafia wants to destroy the rest of the evidence, so it hides the book where the suspicious transactions are recorded so that there is no evidence to support the accusation against its members.
The mafia keeps to itself, but we can't help our detectives finish their work better, that is, to help them track down the suspect and get the punishment he deserves.