A lot less action in The Dead Don't Dream than in a normal Hopalong Cassidy film. This story seems to be taken from some old English murder mystery as Hoppy and his pals become detectives. Not that they were all that much use with Lucky Jenkins getting married and California Carlson just being California.
In fact that's what they're all in the locale for, Lucky is getting married to Mary Ware. The guys stay at a hotel in the middle of nowhere and people keep disappearing out of a certain room at said hotel. Anyone who watches old English murder mysteries knows there's a hidden door someplace. One of the ones disappearing is Mary Ware's uncle, another is the sheriff.
Of course Hoppy figures it all out and Lucky proves to be valuable at the final showdown with the bad guys.
Nice, but not the usual Cassidy type film.
Of course