Andy and the Alien (Sweet Valley Kids #29)
Andy Franklin has heard that UFOs have been seen at Secca Lake,   and he thinks it might be true. His classmates don't believe in UFOs,   and they won't stop teasing him. But when Jessica and Elizabeth   Wakefield follow Andy into the woods during a school trip to Secca   Lake, they see some very mysterious things. Could Andy be right? Are   there aliens at Secca Lake?