Acorna's Triumph (Acorna #7)

Acorna's Triumph is a 2004 science fantasy novel by American writers Anne McCaffrey and Elizabeth Ann Scarborough. It was the seventh book in the Acorna Universe series, which McCaffrey and Margaret Ball initiated in Acorna: The Unicorn Girl (1997). Triumph completed Acorna's biography, which is sometimes called the Acorna series. It was followed by First Warning, sometimes called the first book of the Acorna's Children trilogy.