"A Suspeita" is a thriller of police investigation, that tells the story of Lucia, a renowned police investigator. At age 50, has dedicated her entire life to her profession and is a respected name among her peers. Everything changes during an investigation, a writer that was writing the memoir of one of the drug trafficking lord, and had his phone tapped illegally by Lucia, is assassinated and she is under investigation by her superiors. At the same time, she finds out she has Alzheimer.