The Mystery at Stowe (1928)

When a guest at Stowe House is found dead, killed by a lethal dart, suspicion naturally falls on the resident collector of poisoned weapons from tribes in South America. With the entire house party as potential suspects, what part did the woman explorer play in this sinister tragedy? The local police are baffled, and call on the help of an amateur, whose recent assignment working with bushmen in Africa brings new insight into an increasingly unconventional investigation.