The brother of a nuclear scientist dies but is reincarnated as a dog so he can return to Earth to protect his brother.

A secretary (Gloria Stuart) solves a murder for her boyfriend (Michael Whalen) in the district attorney's office.

Private detective Michael Shayne is on the case again, but this time he's stuck on a jury for a murder trial. So, what does he do? Why, he skips out on sequestration in order to solve the case himself!

In order to win back his girlfriend, Mike Shayne promises to give up his detective practice and get a job as riveter in an aircraft plant. He quickly finds himself investigating the theft of industrial diamonds from the plant's safe and, utilizing a variety of false identities, traces them first to a dress factory and later to a Hawaii-bound ocean liner. Escaping several attempts on his life, he is able to uncover a Nazi smuggling ring, but the location of the missing diamonds continues to elude him.

Police sergeants Johnson and McManus take on Los Angeles confidence tricksters. Con man Tony Wells, lining up rich widow Jessica Royce as his latest mark, sets up a false paranormal society with other charlatans to convince the credulous Jessica that her late son is speaking to her through their sham seances. When the plan leads to murder, Johnson and McManus must bring the group down before they kill again.

A man believed to be dead and buried escapes from his grave and returns to the scene of the crime seeking revenge.

Lloyd Nolan is back as detective Michael Shayne who's in search of a stolen coin.