1. Book 1 is a mystery titled Suspicious Murders. The mystery takes place in a fictional town called Barlene town and it is solved by a group of six best friends. Three doctors get killed within a span of a few weeks. The murderer is a person who had met with a tragic incident because of an irresponsible doctor. He is a relative of one of the main characters enemy. The graffiti and other clues left by the insane murderer and the guidance provided by a senior inspector help the six friends solve the mystery. 2. Book 2 in the series is titled Two birds for one stone because two mysteries get solved in the novel- one is related to the enmity between two protagonists of the novel and the other is a mystery that takes place in the school of the six friends which reopens after the summer vacations. The solving of the mystery eventually reveals the true personality of the principal and administrator of the school and the troubled relation between them and their estranged cousin. The correlation of various incidents taking place in the school and the arrival of a mysterious new girl in school help the six friends solve both the mysteries.