by Andrew Clements

Amazon summary:

Bobby Phillips is an average fifteen-year-old-boy.  Until the morning he wakes up and can't see himself in the mirror.  Not blind, not dreaming - Bobby is just plain invisible.  There doesn't seem to be any rhyme or reason to Bobby's new condition; even his dad the physicist can't figure it out.  For Bobby that means no school, no friends, no life.  He's a missing person.  Then he meets Alicia.  She's blind, and Bobby can't resist talking to her, trusting her.  But people are starting to wonder where Bobby is.  Bobby knows that his invisibility could have dangerous consequences for his family and that time is running out.  He has to find out how to be seen again - before it's too late. 

by Margaret Peterson Haddix

Amazon summary:

Thirteen-year-old Jonah has always known that he was adopted, and he's never thought it was any big deal. Then he and a new friend, Chip, who's also adopted, begin receiving mysterious letters. The first one says, "You are one of the missing." The second one says, "Beware! They're coming back to get you."

Jonah, Chip, and Jonah's sister, Katherine, are plunged into a mystery that involves the FBI, a vast smuggling operation, an airplane that appeared out of nowhere - and people who seem to appear and disappear at will. The kids discover they are caught in a battle between two opposing forces that want very different things for Jonah and Chip's lives.

Do Jonah and Chip have any choice in the matter? And what should they choose when both alternatives are horrifying?

by Gordon Korman

Amazon summary:

Chase's memory just went out the window.

Chase doesn't remember falling off the roof. He doesn't remember hitting his head. He doesn't, in fact, remember anything. He wakes up in a hospital room and suddenly has to learn his whole life all over again... starting with his own name.

He knows he's Chase. But who is Chase? When he gets back to school, he sees that different kids have very different reactions to his return. Some kids treat him like a hero. Some kids are clearly afraid of him.

One girl in particular is so angry with him that she pours her frozen yogurt on his head the first chance she gets.

Pretty soon, it's not only a question of who Chase is - it's a question of who he was... and who he's going to be.

by James Ponti

Amazon summary:

So you’re only halfway through your homework and the Director of the FBI keeps texting you for help…What do you do? Save your grade? Or save the country?

If you’re Florian Bates, you figure out a way to do both.

Florian is twelve years old and has just moved to Washington. He’s learning his way around using TOAST, which stands for the Theory of All Small Things. It’s a technique he invented to solve life’s little mysteries such as: where to sit on the on the first day of school, or which Chinese restaurant has the best eggrolls.

But when he teaches it to his new friend Margaret, they uncover a mystery that isn’t little. In fact, it’s HUGE, and it involves the National Gallery, the FBI, and a notorious crime syndicate known as EEL.

Can Florian decipher the clues and finish his homework in time to help the FBI solve the case?