Melinda Metz 
Vanished [EPUB ebook] 

Gone for good? Max is on a mission to save Alex, who is stranded on the home planet. Alex may be lost or wounded — or worse. To get Alex back, Max knows he’ll need one of the Stones of Midnight. If only he knew where to find one… Liz understands that Max can’t rest until he finds Alex. And she’s been busy herself — spending time with Roswell newcomer Adam. She’s been having so much fun with Adam that Max is in danger…of being forgotten.