I highly recommend this excellent chapter book to any student grades 2-8 in terms of content.  It is a rare story that is appropriate for and can appeal to such a wide age range, but this is definitely one of them.  The AR reading level, however, is 6.5.  This book was a pleasure to read with exciting adventure, suspenseful near escapes, tragedy, well-developed characters you care about or love to hate, and humor sprinkled in for good measure.  There were themes of friendship, justice, loyalty, love, perseverance, generosity, determination and duty.  The cover illustration is beautiful with iridescent wings on the pictured dragonflies and there were several black and white sketches by Mr. Hawkes which added additional interest and enjoyment of the story.  The story is set in Europe in the time period just before, during and just after World War II.  References are made throughout the book to war events which are woven into this fictional story.  This book would be a wonderful addition to every elementary school library.