What devices are used in the story "Lamb to the Slaughter"?By Roald Dahl. I need to justify my answer with examples from the story. I already found...

Looking at this story, I see a simile towards the beginning, when Mary has first sat down to hang out with Patrick.  The narrator is talking about how sitting with Patrick makes Mary feel.  We are told

She loved to luxuriate in the presence of this man, and to feel-almost as a sunbather feels the sun-that warm male glow that came out of him

So "as a sunbather..." is a simile because it is directly comparing her to someone soaking up the sun's warmth.

I also think there's a bit of hyperbole in a couple of places.  One is where she can't feel her feet as she is going down to the freezer.  The other is where the one policeman says that Patrick's head was like it had been hit with a sledgehammer.