Vesper Holly Series by Lloyd Alexander

It's 1872, and adventurous Vesper Holly and her guardian set out for the tiny country of Illyria, on a quest for its legendary treasure. But once Vesper and Brinnie arrive, they are plunged into a fierce struggle between rebel forces— and someone is out to kill the two of them! If anyone can triumph over those kind of odds, it's Vesper — one of Lloyd Alexander's most intrepid (and best-selling) heroines.

Vesper Holly is surprised as her guardian, Brinnie, when she receives a mysterious summons to Central America signed by Alain de Rochefort. Vesper sets sail at once to find de Rochefort and explore the land that she has inherited. On her arrival she makes a terrible discovery--de Rochefort represents the evil Dr... moreVesper Holly is surprised as her guardian, Brinnie, when she receives a mysterious summons to Central America signed by Alain de Rochefort. Vesper sets sail at once to find de Rochefort and explore the land that she has inherited. On her arrival she makes a terrible discovery--de Rochefort represents the evil Dr. Helvitius, who plans to build a canal on Vesper's land, uprooting the native Chirica Indians for pure profit! Can Vesper overcome the dangers of earthquakes, volcanoes, and the evil doctor in time to save her Indian friends? less

Who could resist a once-in-a-lifetime invitation to the Grand Duchess of Drackenberg's Diamond Jubilee Celebration? Not Vesper Holly! Off she goes, with her guardian, Brinnie, and his wife, Mary, and plunges into a plot involving a takeover attempt from neighboring Carpatia.In short order, Vesper finds herself mixed up with Gypsies, a kidnapping, and the discovery of a priceless Leonardo da Vinci portrait. Vesper has her hands full. Especially when the despicable Dr. Helvitius shows up... moreWho could resist a once-in-a-lifetime invitation to the Grand Duchess of Drackenberg's Diamond Jubilee Celebration? Not Vesper Holly! Off she goes, with her guardian, Brinnie, and his wife, Mary, and plunges into a plot involving a takeover attempt from neighboring Carpatia.In short order, Vesper finds herself mixed up with Gypsies, a kidnapping, and the discovery of a priceless Leonardo da Vinci portrait. Vesper has her hands full. Especially when the despicable Dr. Helvitius shows up. Will Vesper be able to save the day—and Drackenberg? less

Returning a library book is easy. Unless the book in question is a rare, valuable, very overdue library book. And it must be retumed to the famed library at Bel-Saaba in the North African country' of Jedera. And it's in the hands of Vesper Holly. Who's guaranteed to turn any seemingly simple errand into an exciting adventure.Adventure it is! Feuding desert tribes, rough terrain, slave traders, and a biting camel all threaten Vesper as she leads a caravan toward the library... moreReturning a library book is easy. Unless the book in question is a rare, valuable, very overdue library book. And it must be retumed to the famed library at Bel-Saaba in the North African country' of Jedera. And it's in the hands of Vesper Holly. Who's guaranteed to turn any seemingly simple errand into an exciting adventure.Adventure it is! Feuding desert tribes, rough terrain, slave traders, and a biting camel all threaten Vesper as she leads a caravan toward the library. But the biggest threat of all is the evil Dr. Helvitius, who awaits Vesper in Bel-Saaba. Can Vesper stop the fiendish plot he's hatching and triumph over her archrival? less

Vesper Holly has foiled murderers, crossed mountains, and narrowly escaped earthquakes. Now she's home in Philadelphia, where she can relax-until President Ulysses S. Grant asks for her help. The Centennial Exposition of 1876 is about to begin, and luminaries from around the world will be there. But so will Vesper's arch-nemesis, the evil Doctor Helvetius. There's only one person who can thwart his evil plans-Vesper Holly!

Vesper and her friends are sailing off to the newly discovered archeological site of Troy. But danger is close behind—and the party is tricked and imprisoned in a fabulous palace called Xanadu. Xanadu’s master is none other than Vesper’s archenemy, Dr. Helvitius, who has a diabolical scheme to dominate the world. His first goal is to destroy Vesper, who has thwarted him once too often. Escape seems impossible. But if anyone can do it, Vesper can!