Romeo Blue is the continuation of the story of Felicity Budwig and her intuitive mind, as first introduced in The Romeo and Juliet Code.  Fliss, as she is nicknamed, is a very smart young girl, probably much like her parents who are spies for America in World War II.  Now a year later, Fliss is set to learn even more about her quirky relatives, including how she has two dads.  Throw in there Nazi spies and the budding pre-teen romance between her and her best friend Derek, and this becomes a light-hearted read full of historical references that could serve to reinforce lessons on WWII and twists that are unexpected.  Definitely upper elementary/middle school material because of historical references and she’s got a teddy bear she still considers to be a companion.  At times it feels a bit old fashioned and may not sit well with students in this digital age.  Given the right framing or book talking, students could pick this up as a stand alone or will be happy to continue the story if they liked The Romeo and Juliet Code.  Recommended for elementary and middle school libraries.