Seven-year-olds Bradley, Brian, Nate, and Lucy make observations and gather clues that convince them that their older siblings, cousin, and animals have been captured by hungry space aliens.

When three leprechaun statues disappear just before St. Patrick's Day, Bradley, Brian, Nate, Lucy, and other friends follow clues in order to prove that Lucky O'Leary is innocent of the crime.

January Joker
When Bradley wakes up in the night to strange lights in his backyard, he wonders if there are aliens in town. His twin, Brian, and friends Lucy and Nate aren’t so certain. But then some kids disappear. Are there really aliens in Green Lawn?

February Friend
Bradley is passing out his class’s valentines, but one of the cards tells the class to look in the closet. Inside they find a rabbit! Then...

Bradley and Brian need help from Nate and Lucy after a hypnotist turns their mother into a duck but does not quite get her changed back.

Bradley, Brian, Nate, and Lucy enter Polly the pony and Pal the dog in a July 4th pet costume contest, but when Independence Day arrives the animals are nowhere to be found.

Someone has been stealing and leaving behind little green sneakers, so Bradley, Brian, Nate, and Lucy trail their new teacher, who wears the same shoes in normal size.

It's a mystery every month from popular A to Z Mysteries author Ron Roy!
July is for Jitters: In the seventh audiobook of the Calendar Mysteries - an early chapter book mystery series featuring the younger siblings of the A to Z Mysteries detectives - the mayor is having a special Fourth of July contest; the person whose pet has the best Independence Day costume gets to be mayor for a day! Bradly, Brian, Nate, and Lucy transform...

While investigating a mystery on New Year's Eve, four friends encounter a big surprise.