I noticed Screwing Up Time by C.M. Keller online.
Mark Montgomery is a slacker content with his life. He's a senior at New Haven Prep, has a great friend, and after graduation he'll get a brand new sports car from his parents, assuming he stays out of trouble. Then, she comes into his life--Miranda with her I-just-escaped-from-a-Renaissance-Fair clothing. Only, she hasn't. She has come from Bodiam Castle in the Middle Ages and demands a secret ingredient and a book of recipes for traveling through the treacherous colors of time. Although Mark has never even heard of either before, he must find them, or Miranda will die. To save her, Mark must break into a psych hospital to visit his grandfather who once tried to kill him, pass through the colors of time, take on a medieval alchemist, prevent Miranda's marriage to a two-timing baron, and keep it all hidden from his parents. The sports car is definitely in trouble.
You can check out Connie's blog here.
Thank you Alex and Ciara for hosting a great blogfest! You guys rock the blogosphere!
Nancy S. Thompson's The Mistaken will hit the bookshelves tomorrow! I'm so excited for Nancy!