At Greenglass House, a smuggler's inn, twelve-year-old Milo, the innkeepers' adopted son, plans to spend his winter holidays relaxing but soon guests are arriving with strange stories about the house sending Milo and Meddy, the cook's daughter, on an adventure.

Flora and Ruby's Aunt Allie is about to adopt the baby she always wanted and the whole family is excited.

Lenny follows Adam for a school project and learns about his family life as an adopted child.

Seventh-grader Ben, always an outsider, is led into a deep friendship with Halley, who is being treated for cancer, by the special dog he and his adoptive mother take in.

Attending his father's annual softball game, Charles spies Champ, a German shepherd puppy that needs to be fostered.

Offering to foster sweet Rottweiler puppy Molly while she waits to find a forever home, Charles learns that Rottweilers are associated with violent behavior and struggles with feelings of fear before realizing that Molly has a truly gentle personality.

When thirteen-year-olds Jonah and Chip, who are both adopted, learn they were discovered on a plane that appeared out of nowhere, full of babies with no adults on board, they realize that they have uncovered a mystery involving time travel and two opposing forces, each trying to repair the fabric of time.

When Arfy finds a homeless kitten, he writes letters to prospective owners, hoping to find the perfect home for his new friend.

When Little Critter hosts a pet fair at school, that features animals big and small, furry and feathery, he finds himself wanting a pet.

A cat arrives at a shelter, arranges to go home with a good family, and settles in with them, all the while letting them know who is boss and, finally, sharing his real name.