Talisman is a series of four children's books written by Allan Frewin Jones and published in 2005. The main characters are Olivia (Olly) Christie and Josh Welles who live with Olly's father and Josh's brother, who are archæologists, and the plot concerns the hunt for the 'talismans of the moon'. Although there are only four books currently in the series, there are more than four of the 'Talismans of the Moon'. Source: Wikipedia (en)