Eighteen-year-old Emily Heath would love to leave her dead-end town, known locally as "The Sham", with her boyfriend, Jack, but he's very, very sick; his body is failing and his brain is shutting down. He's also in hiding, under suspicion of murder. Six months' ago, strange signs were painted across town in a dialect no one has spoken for decades and one of Emily's classmates washed up in the local floods. Emily has never trusted her instincts and now they're pulling her towards Jack, who the police think is a sham himself, someone else entirely. As the town wakes to discover new signs plastered across its walls, Emily must decide who and what she trusts, and fast: local vigilantes are hunting Jack; the floods, the police, and her parents are blocking her path; and the town doesn’t need another dead body.