Secret doors - Gwen Fishers second case

Many consultants promise absolute security for money. Who would not like to know that their property, data and money is safe from thieves? A dead man without a murderer guarantees Chief Inspector Gwen Fisher sleepless nights in her second case. When a burglary without traces is also reported, the LKA is initially helpless. Does her 15-year-old son have enough knowledge to lead the investigators on the right track? Gwen and her colleague take up the challenge and enter a part of the Internet that they had not known until then.