If This Book Exists, You're in the Wrong Universe

The town of Undisclosed has more than its share of interdimensional parasites, demonic cults and teenage sorcerers, and tourists now come to gawk at it. The latest problem is a toy: a plastic egg meant to hatch a cheerful stuffed bird when a child feeds it through a phone app. What is actually inside is coaxing local kids into killing people and posting the pieces into it like a piggy bank, and filling it will end the world. Dave, John and Amy handle this sort of thing so nobody else has to, occasionally for money, and this one is well above their pay grade.