In the summer of 1995, two girls that were susceptible are accused of murdering their schoolteacher. The two girls go their separate ways was charged with the murder. Fastforward to modern moment. Happily married mum Serena is in exactly the seaside town for the very first time as she cares for her mother Rachel. Poppy is currently living in conditions. Having served seventeen years for a crime she insists she did not commit, she's only one thing in her mind... the truth. Of course if she did not kill Marcus, then who did?