Liz is excited for her sleepover at the museum until she hears some spooky noises that may turn this sleepover into a nightmare.

Members of the Critter Club are all excited about their summer plans until Liz learns that, instead of taking an art class, she will have to be in summer school to improve her math skills, but a fun teacher, a classroom pet, support from her friends, and advice from her brother might get her through.

Valentine's Day is near, and to raise money for a charity called Puppy Love, Ellie persuades the other Critter Club girls to join her in selling and delivering singing telegrams.

After winning the lead role in a play, acing a spelling test, and finding money, second-grader Ellie wonders if the Critter Club animal shelter's newest animal--a little pink pig--is bringing her good luck.

"Amy has never liked being in the spotlight. When all her friends decide to form a team for the Santa Vista Quiz Bowl, Amy's not so sure. She knows she can answer the quiz questions ... but can she do it in front of hundreds of people? Meanwhile, The Critter Club is caring for some chickens who need a home. As the Quiz Bowl approaches, Amy herself starts feeling just a little bit chicken!"--

Marion volunteers at the Santa Vista Arboretum butterfly release and helps her younger sister Gabby overcome her fear of bugs so she can also attend the event.

Taking a turn caring for the class pet hamster, Marion is devastated when the hamster goes missing and she receives an anonymous letter in her locker with clues leading to a mysterious scavenger hunt.