More like The Forbidden Lock

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KairosSeries
series11 books1962
completed
Start with A Wrinkle in Time →
Artemis FowlSeries
series15 books2001
Fantasy, about fae.
“As of 2013, the novels have sold more than 21 million copies in 44 languages, and are one of the best-selling series of all time.”
from the catalogue
Start with LEPrecon →
The Heroic Adventures of KateSeries
series3 books1990
Fantasy.
“T. A. Barron links three standalone novels around a resourceful girl named Kate confronting environmental threats through fantastical means.”
from the catalogue
Start with Heartlight →
TimeRidersSeries
series9 books2010
Tense in tone, about survival.
“Because time travel is here, and there are those who would go back in time and change the past.That's why the TimeRiders exist: to protect us.”
from the catalogue
Start with TimeRiders →
Molly MoonSeries
series6 books2003
Fantasy, about psychic powers.
“For ten miserable years she's lived under the cruel rule of Miss Adderstone in grim Hardwick House.”
from the catalogue
Start with Molly Moon's Incredible Book of Hypnotism →
The Sixty-Eight RoomsSeries
series4 books2010
Fantasy, set in north america.
“Almost everybody who has grown up in Chicago knows about the Thorne Rooms.”
from the catalogue
Start with The Sixty-Eight Rooms →