There are mixed messages all over Waterloo Road, and you don't have to read between the lines to find them. Recently installed Head Teacher Karen Fisher has both her daughters, Bex and Jess, back with her now, along with her son Harry, but Bex comes with some dangerous baggage in the form of a demanding ex-boyfriend, Hodge, who'll stop at nothing to get her back, including seducing Jess. Meanwhile Grantly has fallen into a rut with his wife in a care home and needs some care himself. Ruby takes him on, but confused signals leads Grantly to feel that there may be more to her intentions. Francesca Montoya, the Spanish teacher, finds herself heavily in demand from an eager Tom Clarkson, but she's already crossed a very dangerous barrier and started an affair with a pupil that could send her to prison if they aren't very careful. While Karen Fisher struggles to maintain the separation of boys and girls into different teaching groups, she must juggle the politics of a new head of pastoral care, student homosexuality, angry parents and children who are mothers themselves. And when someone close to her hacks into her e-mail to send aggressive messages to her fellow teachers, it could lead to her downfall. In one of the tensest, most exciting terms at Waterloo Road yet seen, these mixed messages and more lead to dangerous, illegal and possibly even deadly conclusions.