The Others. Tessa Extra-Sensory Agent, #2

Tessa's innate ability has developed beyond expectation, and her telepathic skills make her an asset for the Extra-Sensory Agents Unit. Fresh from an adventure that sharpened up her power, she embarks on a delicate operation to find a teenager telepath, who may be stealing top-secret information. Tessa believes that her task only involves attending high school for a while and investigating an information leak there, but in reality, her mission is not what she thinks.
Moreover, the government has different plans for her. After she finds other telepaths among her schoolmates, Tessa discovers that the government's endgame may mean death for her and others. Together they engage in a cat-and-mouse game that has survival as its prize.