The evidence of the videotape convinces Karen Parks her husband has been abusing their daughter. CID arrest him on suspicion of murder, but CCTV footage from an off licence provides him with a cast-iron alibi for the time of Chloe's death and he is released without charge. Will's persistence leads to a tense encounter with the family, and Callum resorts to desperate measures to ensure justice is served. (thetvdb.com)