Anna May Wong (Shanghai Express), Akim Tamiroff (Spawn of the North), and Gail Patrick (My Man Godfrey) star in Dangerous to Know, a hard-hitting crime drama from director Robert Florey (Murders in the Rue Morgue), inspired by the life of notorious mobster Al Capone. Crime lord Stephen Recka (Tamiroff) will stop at nothing to marry socialite Margaret (Patrick), including murder and blackmail. However, his pathologically jealous mistress Lan Ying (Wong) will stop at nothing to keep them apart. Based on Edgar Wallace's hugely successful play On the Spot - which was such a big hit that several studios repeatedly attempted to bring it to the big screen, only to be rejected by the censors at the Production Office - Dangerous to Know is marked by its standout performance by Chinese American screen legend Anna May Wong, reprising her stage role.