She has a very high IQ, an eidetic memory, and an incredible ability to decipher codes and patterns. She is also convicted of killing a priest. In an English prison, she is far away from her home and family in Salamanca, Spain. Although DNA evidence places Maria at the scene of the crime, she maintains that she is innocent. Amidst accusations that she is lying, Maria begins to remember things…. a strange room, strange people, being tested upon….but she still does not recollect ever committing murder. As Maria begins to put the pieces together, she starts to suspect that she may be at the heart of a conspiracy involving MI5, and a project known as Callidus. Who can she trust? Who are her friends and who are “handlers” that are watching her every move? Maria must find out what her role is in Project Callidus – before it is too late!