The Arizona Rangers give Tyrone Cannfield a tall order: he must get himself interned in an army punishment camp with hard labour and escape from the chain gang to track down the murderous Shadow Rigers gang. Furthermore, alone he must bring in the gang's leader Mingo, and halt a train robbery. Yet Cannfield will do everything possible to eliminate him and the Shadow Riders--Mingo was the man who murdered his wife back in Texas...but can he survive?