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Synopsis:

Passions run high in an explosive return of this critically acclaimed crime series. Based on an idea by best-selling novelist Val McDermid. Lab assistant Emma Hedges (Molly Windsor, Three Girls) is now training to be a forensic chemist, and on the cusp of seeing her mother's murder case finally resolved. Daniel (Martin Compston, Line of Duty) is to give evidence against his father. Will Emma and Daniel's relationship withstand the pressure? Will justice be served? Meanwhile, professors Sarah Gordon (Laura Fraser, The Missing) and Kathy Torrance (Jennifer Spence) are investigating a deadly bombing campaign. Homemade devices are going off around Dundee, with critical clues hidden inside the bombs. Will the team track down the bomber before their identity goes up in smoke?