“The Frog Prince chooses a wife… She must be quiet…. Obedient…. She must respect the old frogs… And what awaits her if she disobeys: a rotting swamp or a crown of lilies?.. Marry the prince—and you’ll find out.”.... Into the hands of detectives Makar Ilyushin and Sergey Babkin falls a strange book. Are the real stories described in it, or is it the fruit of a sick imagination? And why do people connected to it die?