Odessa Fremont (Guardians of the Time Stream)

Ess Fremont already hated her boarding school before discovering the headmistress was trying to steal her inheritance. With her archeologist grandparents presumed dead in South America's turmoil, and her older brother missing, she struck out for freedom.

Guided by her grandparents' maxim to always help where she was able, and aided by their inventions, Ess made her mark. First step: reveal a Resurrectionist plot to the Secret Service before the Southerners could re-start the Civil War.

Disguised as a boy, Ess headed West. Sharp eyes, scientific principles, and engineering knowledge put her in the right place at the right time to do the right thing. Powerful allies included President Lincoln, the Secret Service, circus performers, train inspectors, and Pinkerton agents. Not bad for a girl between her fourteenth and seventeenth birthdays.

If she could only find her missing brother and uncover the secrets their grandparents kept from them...