Can a mysterious sea creature save eleven-year-old Jamie's very sick twin brother?

Ben and Zoe travel to the Kalahari Desert in Namibia to rescue a lion cub who has fallen down a well, but a sandstorm threatens to overwhelm them before they can get the cub back to its pride.

At first Poppy is thrilled by her twin baby sisters, and delighted that her grandmother has come to help--but soon she finds that the two babies are taking up all the adult's time and energy, and she starts to feel angry and neglected.

Flood City is the only habitable place left on the drowned Earth, but it is also a battleground between the Star Guard who have controlled the city for decades and the Chemical Barons in their spaceships who once ruled the planet, want it back, and are now preparing to destroy it; the future will depend on Max, his sister Yala of Flood City, and Ato, a young Chemical Baron who just wants to keep his twin brother alive and not hurt anyone--and somehow...

Trapped underground in the catacombs and made to transport the bones of ancient dragon rulers to the extracting room, where others extract the magical properties dormant in the bones, twin Thisbe must learn how to control her own fiery magic and use it to escape.

As their cross-country journey with their parents continues through the midwest, twins Coke and Pepsi, now thirteen, again face strange assassins at such places as the first McDonald's restaurant and Cedar Point amusement park.

Bick, Beck, Storm, and Tommy have one week to traverse the Australian Outback, locate Charlotte Badger and her pirate cronies, and find evidence to prove their parents innocent of stealing rare opals.

"Devastated by loss and hampered by war, Fifer struggles to regroup and continue the search for her twin. Meanwhile Thisbe, pounded by images of Grimere's dark history, contemplates her abandonment and considers leaving Rohan behind in a risky move that could take her home... or to her death--

While armies of the Shadowrealms gather and Machiavelli goes to Alcatraz to kill Perenelle Flamel, fifteen-year-old twins Sophie and Josh Newman accompany the Alchemyst to England to seek Gilgamesh.

Twins Arthur and Maudie set sail in their sky-ship to find noted explorer and author Ermitage Wrigglesworth, but their newly-discovered aunt, Eurora Vane, is also seeking him--and a secret he'd just uncovered.