Heartstream by Tom Pollock

Cat is in love. Always the sensible one, she can’t believe that she’s actually dating, not to mention dating a star. But the fandom can’t know. They would eat her alive. And first at the buffet would definitely be her best friend, Evie. Amy uses Heartstream, a social media app that allows others to feel your emotions. She broadcasted every moment of her mother’s degenerative illness, and her grief following her death But on the day of Amy’s mother’s funeral, Amy finds a strange woman in her kitchen. She’s rigged herself with explosives – and she’s been waiting for Amy. Who is she? A crazed fan? What does she want? Amy and Cat are about to discover how far obsession can go.