"The pear of agony!" whispers Elsa Glinou in shock, as she faces the body of young Zoe Komninou, who just a few hours ago claimed responsibility for a series of unsolved murders.

This phrase will lead her and Inspector Manos Varsamis to a horrifying realization: Someone is killing people using methods that date back to the Middle Ages. Who is spreading death with gruesome tortures? What is their motive? What connects their victims? What role do Stathis Komninos, Professor of Medieval History Jordanis Fokas, and journalist Fotis Bakirtzis play in this case? What does the phrase Memento mortis, which Elsa discovered in Zoe's diary, mean?

Trying to answer these questions, Elsa and Varsamis will unravel the thread of a terrifying story that will endanger the lives of two innocent children. Will they manage to save them before it's too late?

Time is running mercilessly, and they are thrown into the hunt for the unknown killer with only one clue: Inspector Yavroglou's conclusion:

"They were all innocent."