The Hunt For The Shalimar Stones by John David Gabriel King

20) As part of a wicked plot, an evil ambassador has stolen the queen`s jewels. They are the power behind her throne, and her planet stands on the verge of civil war. Without these royal stones the queen cannot save her planet from dreadful war. Her daughter Princess Diana, calls upon and old friend, a Starship commander, from a powerful distant empire of their galaxy, to find and return the stones in the 72 hours her planet has left, or all is lost.