When nine-year-old Alex and his friend Yasmeen investigate the disappearance of cats in their neighborhood, they stumble onto a larger mystery involving a haunted house and a ghostly cat.
With the help of their rambunctious dog, Hooligan, seven-year-old Tessa and ten-year-old Cammie, daughters of the first female president, investigate when Dorothy's ruby slippers vanish while on loan to the White House.
In 1949 Philadephia, Mary Mouse and an orphan named Caro embark on an adventure when they team up to expose criminals and make the Cherry Street Orphanage a safe haven for mice.