When Posie Parker's childhood friend is robbed of the priceless Maharajah diamond and becomes a suspect in a cold-blooded murder case, budding detective Posie vows she will clear his name. Aided by her seriously gorgeous assistant Len, Posie soon realizes things are not quite as they seem, and the darkly-glamorous world of London's theatre and glittering nightclubs prove far more dangerous than she ever could have imagined.