Poseidon

Heather and her team along with a Division Three Robbery Team are sent to Poseidon to investigate a series of robberies in which four people have been killed during the robberies. The victim was always someone wealthy and he or she was along. Two of the victims lived on Poseidon and two were there on vacation.

Heather splits her team and the robbery team in to two other teams and their four teams stop at the planets where the victims of the robberies and murders had lived. On the way to Poseidon there is another robbery and the man is killed.
All the killings appear to be random, like the victim coming home and interrupting the robbery and getting killed in the process. However, upon a closer look Heather realizes they were not random and it was not the victim interrupting the killing. Instead, it was the killer waiting for the victim for some reason.

Heather and her team realize that this is murder for hire and the robberies are only to cover up that the five victims were all intended victims and someone paid to have them killed. The problem is the five victims come from four different planets. That means the murders were all arranged on Poseidon or someone took out ads for a "Murder Inc" business on those planets, or maybe every planet and moon in the United Affiliation of Planets. That means Heather must discover the identity of the murderer, the person that paid to have their loved one killed and the person behind this "Murder Inc." The only thing the victims all have in common is they were wealthy, but then Poseidon is the playground of the wealthy.