Thanassakis a secret agent? Yes, the incredible little one decides to show us his detective talent. His dad's hat and glasses become the perfect disguise, and his friend Haris with his mom's hat and glasses becomes the perfect assistant. The unbeatable duo is ready to take on the most difficult missions. Their specialty is surveillance, boldly and persistently watching everyone: the frivolous Jenny, the peace-loving Apostolis, and the extremely dangerous Rosa. But Thanassakis' real target is Sissy's house, the girl who has stolen his heart. He sets up outside for hours, despite Haris' protests, hoping to discover hidden aspects of his beloved's life. Of course, Thanassakis' secret activities are clearly leading to: hilarious situations and plenty of laughter.

Another little book by Arkas featuring the little boy loved by thousands of readers, while he only wants to be loved by one person: Sissy.