Mary Pope Osborne

Annie and Jack go back in time to Camelot to a haunted castle to find the Stone of Destiny. Their quest involves lots of spooky things as well as an apprentice wizard, Morgan LeFay's nephew.

Annie and Jack travel back in time to the first Olympic games to retrieve a lost story. There they learn a lot about what girls were — and were not — permitted to do in Ancient Greece.

Annie and Jack travel to a long-ago Ireland to inspire Augusta to share her creativity with near calamitous results. How the sibling team solves the problem and achieves their mission is a worthy addition to this appealing series.

Greek gods often interfere with humans as they do with Odysseus and his men as they head home after the Trojan Wars. The start of their journey is vividly retold and newly illustrated for younger listeners and readers.

This lively, informative companion volume to Eve of the Emperor Penguin provides more particulars about the Antarctica and its inhabitants. This book, as well as others in the series, will encourage children to want to learn more.

This companion volume to Annie and Jack's colonial adventure (Thanksgiving on Thursday in the Magic Tree House), provides information about those who arrived on the Mayflower, what they confronted, and more. Illustrations enhance the accessible information, as do occasional asides from Jack and Annie.