Since his father's death, Ever Barnes has secretly been in charge of an amazing mechanical building but now, ruffians are after him and his new friend Hannah, the building owner's spunky daughter.

Sisters Jessa and Oona, and new friend Ram Sam Sam, try to stop the Cobalt Prince from Toki, who orders a strike on Mon Domani, starting a new war between the worlds.

On the aethership's maiden voyage, Seraphin and the Knights of Aether had prepared for everything--except treason. The villainous chamberlain wants to overthrow King Ludwig and claim the electro-aetheric technology for Prussia. The only escape for the king and his companions lies in the frosty skies above Bavaria. The ship's first flight is a success, but their respite is short-lived. As long as the chamberlain is free to spread his lies, these travelers...

"Like a bolt from the blue, Jack's little sister Maddy is gone--carried into another realm by an ogre. When Jack and Lilly follow Maddy's captor through the portal, they are ready for anything . . . except what they find waiting for them in the floating crossroads between worlds. Even the power of their magic plants may not be enough to get them back to earth alive. Alone and injured, Jack and Lilly must each face their own monsters--as well as giants...

Jack might be the only kid in the world who's dreading summer. But he's got a good reason: summer is when his single mom takes a second job and leaves him at home to watch his autistic kid sister, Maddy. It's a lot of responsibility, and it's boring, too, because Maddy doesn't talk. Ever. But then, one day at the flea market, Maddy does talk to tell Jack to trade their mom's car for a box of mysterious seeds.