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The entire family of student Mat Pine - father, mother, brother and younger sister - were found dead while on holiday in Mexico. The official cause of death is a gas leak. The local police claim it was an accident, but the FBI has a different opinion. So does the Met. What's more, he suspects that his family's death may have something to do with another death. One that happened many years ago. When his own brother killed his pregnant girlfriend one night...

Now, together with investigator Sarah Keller, Mat must unearth the gruesome truth about the crime his brother is accused of.