This was the perfect mixture of fantasy and real world.  I loved the main character Ryan and her love of science.  The secondary character Greta was just as powerful.  She was so fun and the perfect quirky/smarts combination.  Their cat was such a fun part too.  The great thing was the age difference between Greta and Ryan.  Not many books show the benefits of friendships with an age gap.  I love the “found family” aspect when she goes to meet the others.  The fast pace and witty banter was hilarious and exciting.  I can’t wait for the next book in this series!