The Mark is a tattoo that must be swiped by special scanners for everything from employment to transportation to shopping. It's almost Logan Langly's 13th birthday and he knows that he should be excited about getting the Mark, but he hasn't been able to shake the feeling that he's being watched. Not since his sister went to go get her mark five years ago . . . and never came back. When Logan and his friends discover the truth behind the Mark, will they ever be able to go back to being normal teenagers?