*The Sunday Times bestseller* 'Smart, sassy and totally on point.' SARAH PINBOROUGH, BESTSELLING AUTHOR OF BEHIND HER EYES 'Fast-paced and full of excitement...It kept me gripped.'KATERINA DIAMOND, AUTHOR OF THE TEACHER YOU HAVE SIX SECONDS TO READ THIS MESSAGE... The body of a 15-year-old is found hours after she sends a desperate message to her friends. It looks like suicide, until a second girl disappears. This time, the message is sent directly to the Metropolitan Police – and an officer's younger sister is missing. DS Nasreen Cudmore and journalist Freddie Venton will stop at nothing to find her. But whoever's behind the notes is playing a deadly game of hide and seek – and the clock is ticking. YOU HAVE 24 HOURS TO SAVE THE GIRL'S LIFE.MAKE THEM COUNT. 'Creepy, clever and unnerving,' C. L. Taylor ''Heart-pounding suspense...' Sharon Bolton