Elsie enjoys hanging out with her younger sister Rosemont, but the one thing Rosemont does that drives her big sister mad is copy everything Elsie does.

Lotti is a shy girl who retreats into a world of books and reading, but eventually learns to make friends with other kids who share her passion, and reconnects with the real world (including her brother). Includes reading recommendations throughout.

Twins Theo and Alexander, their older sister Wil, and five new friends find themselves at an electrifying manor run by Mister Frank and Dr. Stein.

When eleven-year-old Perpeuta promises to save her family from financial ruin, she sets off on a quest with her younger brother, a stolen horse, and a chicken in search of a valuable coin.

As the evidence continues to mount, Micah is convinced that his newborn sister Lily is not a human baby, but is actually a Martian.

Ten-year-old Kara follows mysterious tracks in the snow that lead her across time and space from modern-day Sweden to 1942 Germany where two siblings are hiding from the Nazis.

Older siblings welcome and enjoy showing love to the new baby.

Walt's magical ability to bring maps to life puts him, his twin sister Van, and new friend Dylan in danger when an enchanted heirloom strands them in the fantastical world of Djaruba and they discover a malevolent rival to the kingdom, a fellow mapmaker, has nefarious plans for Walt.

"Living on their own on Manhattan's Lower East Side while their Pop is off fighting in World War II, twelve-year-old Dory Byrne and her brothers discover an abandoned hotel that proves a perfect hideout just when they need it most"

The Sinister-Winterbottoms, twins Alexander and Theo and their older sister Wil, find themselves at a mysterious summer camp where they meet other families whose parents are missing.