Welcome to the Scientific Police Laboratory. Here, Inspector Inácio Caetano leads a forensic team responsible for analyzing evidence and clues that will help uncover who killed Steven Mendes, a Portuguese-English man found dead on his estate in Portugal, considered by many to be a quiet person with no enemies. However, the elements collected that lead to the truth of the events turn out to be full of deep secrets that everyone was unaware of... Inácio will have to follow his instincts to unravel what really happened without being deceived and even be able to prove, in the end, that everything happened for the least expected reason... and by the least expected person!