When Caitlin Bennet returns to her old school as a new teacher, she is determined to turn the lives of her students around. Disruptive classes – no problem. An unsupportive head teacher - fine. Then, she finds herself accused of a crime which could end her teaching career. She sets out to clear her name, but to do so she must revisit the hellish past she has tried so hard to escape.

Pan ddychwela Caitlin Bennet i'w hen ysgol fel athrawes newydd, mae'n benderfynol o newid bywydau ei disgyblion. Dosbarthiadau trafferthus - dim problem. Pennaeth anghefnogol - yn iawn. Wedyn, mae rhywun yn ei chyhuddo o drosedd a allai ddwyn ei gyrfa i ben.