Exile for dreamers

"Tess Aubreyson is being haunted by prophetic dreams of death and grief. She discovers that her dreams can help Lord Ravencross, the man she loves, and her fellow students at Stranje House. Which is good, because the traitorous Lady Daneska and the Ghost have returned to England to help make way for Napoleon's invasion, and the young ladies at Stranje House might be the only ones who can save England from a power-mad dictator."--OCLC.