Those familiar with the Whistler series, of which these are the fifth and sixth parts (each a story to itself), will know that there is ingenuity to plot and setting every time. Of these two, the second - about an artist married to a rich , dying woman - is the better even if Mysterious Intruder has some fine moody noir scenes, all alleyways and ill-lit premises.
As for Secret, much is owed to model and femme fatale Leslie Brooks - and leaves one eager to seek out her later Blonde Ice, in which she disposes of a series of husbands (something of an aspiration in this one).
Two more Whistlers to go - a treat in store for anybody who welcomes an intelligent diversion.