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'.
The tears of Isis are sapphires, hidden away in an ancient Egyptian pyramid.
This time, Olly and Josh are in China, on the hunt for the second talisman of the moon, the 'mooncake of Chang-O.
Olly and Josh are looking for their third talisman of the moon, the 'Amulet of Quilla', in South American ruins.