Nikola Kross Series by Eliot Sappingfield

Nikola Kross has given up on living in harmony with classmates and exasperated teachers: she prefers dabbling in experimental chemistry to fitting in... moreNikola Kross has given up on living in harmony with classmates and exasperated teachers: she prefers dabbling in experimental chemistry to fitting in. But when her life is axially inverted by a gang of extraterrestrials who kidnap her dad and attempt to recruit her into their service, she discovers he's been keeping a world of secrets from her--including the school for geniuses where she's sent for refuge, a place where classes like Practical Quantum Mechanics are the norm and where students use wormholes to commute to class. For Nikola, the hard part isn't school, it's making friends, especially when the student body isn't (entirely) human. But the most puzzling paradox of all is Nikola herself, who has certain abilities that no one understands--abilities that put her whole school in greater danger than she could have imagined. less

Nikola Kross has battled aliens and won. But her father, who was kidnapped by evil extraterrestrials, is still missing, and now it's up to Nikola and her friends to find and rescue him before it's too late. He could be anywhere in the known universe, and they have little to go on except a desperate secret communication--"Kindly rescue me at your earliest convenience"--and an unhelpful clue that he's in a secure facility somewhere deep underground... moreNikola Kross has battled aliens and won. But her father, who was kidnapped by evil extraterrestrials, is still missing, and now it's up to Nikola and her friends to find and rescue him before it's too late. He could be anywhere in the known universe, and they have little to go on except a desperate secret communication--"Kindly rescue me at your earliest convenience"--and an unhelpful clue that he's in a secure facility somewhere deep underground. But the extraterrestrials are still determined to capture Nikola. And if she gets abducted, she won't have to wonder where her father is . . . because she'll already be there. In this funny and exciting sequel, Nikola and her friends discover new and unexpected allies and come face-to-face with a strange and mysterious enemy, one so powerful and so dangerous, they dare not speak his name. less