Desideratum:Obscure Cases

Zachary Anderssen enters the world of sleuths since his head detective father was killed by unknown person. As he solve mysteries and crimes towards his father's death case, he will encounter people who probably knew something on his father's death. The syndicate gang of "Sigma" has been hunted for generations for their remorseful crimes and murders. Sandra Barens, the sister of the gang's leader, team up with Zach after the gang brought devastation to her family and country. With Zach's partner-in-crime Carter Williams, and Sandra, join them in their adventure full of mysteries to the fullest truth about Sigma gang and his father's death mystery.
Who killed him?
What is their motive?
Will they solve it, or remain as his DESIDERATUM.