Pipeline — D.K. Greene

When the Jones brothers beg for a sleep-over with a friend from school, Mac doesn't see a mysterious plot unfolding.She sees the opportunity to watch a movie away from her kids' prying eyes.Mac doesn't know the sleepover guest is smuggling something vile into the house, and he won't be taking it with him when he leaves.As a ferocious beast tears her home to shreds, Mac is forced to discover the true identity of a hideous doppelganger, track the savage creature taking up residence in the bathroom, and take cupcakes to school.