They have recommendations galore, heaps of praise for favorites of the genre both old and new, and some hot takes about Agatha Christie to share. They also talk about the difference between thrillers and murder mysteries, discuss mysteries in televsion vs movies vs books, and get very very excited about Knives Out.
For those who have not yet seen Knives Out, be aware that at 1:02:41, Helena and Matty begin Knives Out Spoilercast 2k19, where they talk about the movie in all its glory. If you have not seen it yet and want to avoid spoilers, don't worry, you can stop right there and you won't miss anything else (except for some talk about the Oscars because yes, sadly, they are already thinking about the Oscars).
They do obviously discuss The Sweater and Daniel Craig's accent, in case you were worried.