The TV series "Who is Erin Carter?" is a British-American adventure thriller about a teacher who finds herself at the center of a criminal investigation. Erin Carter is a regular Englishwoman living with her family in Barcelona. One day, she goes to the supermarket to buy groceries and, along with other shoppers, becomes a hostage of armed robbers. After being rescued, she is questioned at the police station as a witness, but it is unexpectedly revealed that Erin herself has a number of dark and unsavory secrets in her past.