At a Hallowe'en party, Joyce - a hostile thirteen-year-old - boasts that she once witnessed a murder. When no-one believes her, she storms off home. But within hours her body is found, still in the house, drowned in an apple-bobbing tub. That night, Hercule Poirot is called in to find the 'evil presence'. But first he must establish whether he is looking for a murderer or a double-murderer . . .

"Cecilia Calhoun's transition to Cap Central has been rough. She joined the school's step team to make friends and keep busy. But the team's co-captain, Brennay Baxter, is a dictator. She makes life miserable for any girl who doesn't do what she says. Worse, Cecilia is convinced Brennay is behind an anonymous online game that awards points for every interaction wtih an autistic student. And she's disgusted with herself for not putting a stop to the...