Nimbus, Halifax, 2006, 1^st.  ISBN 1-55109-562-9.  Trade soft cover, 127 pages.  Unread copy, not remaindered.  ‘It’s summertime in Mahone Bay, and Angela and Emmie are cat-sitting on Mason’s Island – and searching for pirate treasure they think might be buried there.  But when they discover a very different kind of treasure on the isolated island, they also put themselves in serious danger.  From one life-threatening situation to the next, the girls are getting deeper and deeper into trouble!  Who’s responsible for the mysterious treasure?  How will Angela and Emmie escape this mess unscathed?  Follow the girls as they come face-to-face with the danger at Mason’s Island.’ (from rear wrap)