The nominal plot has stout-hearted Colonel Loring Leigh (C. Aubrey Smith -- who else?) kicked out of the Lancers for signing an order allowing a shipment guns to find their way into the hands of a band of Indian rebels, who end up massacring 90 men at one of those Indian passes so famous in '30s movie adventure yarns. Colonel Leigh is drummed out of the army but knows he's been set up and his signature forged. Returning to England he summons his four sons -- dim bulb Oxford student Rodney (William Henry), pompous barrister Wyatt (George Sanders), shallow ladies man/aviator Chris (David Niven), and stuffy British attache Geoffrey (Richard Greene) -- in order to show them the evidence proving he was framed by an international gun cartel. He doesn't get that far. While the boys are sipping bitters in the ante room, Colonel Leigh is shot dead in his study and the evidence removed. The press claims Leigh committed suicide from his disgrace, but the boys know better and set about to find his killer and clear his name.
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