Eleven-year-old Miri Gill feels left out in her family, which has two sets of twins and her, until she travels back in time to 1935 and discovers Molly, her own lost twin, and brings her back to the present day.

Jonah was able to save all of time from collapsing but in doing so gained a twin brother, Jordan, who must learn what has happened and do his own part to save time--and his parents.

In World War II England, ten-year-old Lottie is transported via a portal to present day Wisconsin, where she must find her way back to her family and her best friend, Kitty.

When Ms. Information kidnaps the President's daughter, it is up to twelve-year-old Ruby, also known as Pufferfish, to use her super-nanobyte-enhanced allergies in leading the NERDS' investigation.

Life seems to be back to normal for "newly twinned" sisters Miri and Molly until their magical house sends them on new time-traveling adventures, including meeting Molly's mother in 1918 and saving two unusual soldiers during the Civil War.

When nine-year-old Odessa Green-Light stomps out her frustration at being sent to her room after shoving her annoying little brother, one particularly big stomp sends Odessa flying through the floorboards and mysteriously twenty-four hours back in time.

Nicki and Snorri are trapped in Time, and Septimus Heap goes on a quest to find the House of Foryx, a place where all Time meets.

Sam Faulkner travels back in time to medieval Ireland, ancient Egypt and Renaissance Bruges in search of his missing father.

Molly Moon's hypnotic eyes give her the power to stop the world and travel through time. Now Molly makes a stunning new discovery - she's a mind reader! But can her incredible talents help to rescue her lost twin from future? And will Molly be a match for the maniacal Princess Fang and her crazy mind machine?