Keys to Death(2002)

Keys to Death is a detective series following private investigator Stas Severin as he takes on a murder case from an old friend. When the friend's wife is killed, Stas discovers the crime connects to a substantial inheritance left by a renowned antique collector named Arefyev. The suspects form a tight circle of wealthy heirs, each with motive and opportunity. Armed with a cryptic key that may unlock the truth, Stas navigates a web of deception and hidden agendas to identify the killer. The investigation grows increasingly complex as he uncovers secrets buried within the collector's estate and the lives of those who stand to gain from his wife's death.