Gertrude Warner

The Alden family rents a houseboat to drift down the river, and encounters a mystery in the little towns along the river, involving a fast black car.

The adventures of the four Alden children as they spend a summer vacation on their very own island, purchased by Grandfather's father years ago.

Two brothers take summer jobs at a department store where a series of peculiar events brings them under suspicion.

The Aldens are spending a week at Camp Seagull on beautiful Claw Island. But as soon as camp begins, they realize that someone is not playing fair. Everything begins to go wrong for the Aldens they lose their luggage, Henry misplaces the camp flag, and the campers on the other team use one of Jessies ideas to score points for themselves. Are some campers so desperate to win the Olympics that they are willing to cheat? The Boxcar Children are...

The Aldens climb a mountain and find a mystery! The hike up Old Flat Top was only supposed to take a day, but a dangerous rockslide changes everything to reveal a hidden cave that just may hold a legendary treasure!

Orphans Henry, Jessie, Violet, and Benny Alden discover that a mystery surrounds the run-down yellow house on Surprise Island.

On their way out west to spend the summer with their Aunt Jane, orphans Henry, Jessie, Violet, and Benny Alden spy a "mystery man".

Orphans Henry, Jessie, Violet, and Benny Alden have a home with their grandfather now, but their adventures are just beginning when they spend the summer camping on their own private island.