The Cure to My Sickness (Another Disease)

When it rains, it pours. Two serial killers, Zach and Daniel, are thrust under Dexter's tutelage—one budding and overzealous, the other, already prolific and inscrutable. With impeccable timing, Astor and Cody are also entrusted to his care after their grandparents fall ill. All four prove equally intractable. And the icing on the cake? He might be falling in love with his sister.