68 books • 8 series
Book #1: Case of the Lost Boy
Book #2: The Case of the Mixed-Up Mutts
Book #2: The Case of the Missing Family
Book #4: The Case of the Fire Alarm
Book #5: The Case of the Library Monster
Book #1: Dear Beast
Book #2: The Pet Parade
Book #3: Someone Is Missing!
Book #4: Dear Beast: Simon Sleeps Over
Book #1: The Haunted Library
Book #2: Ghost in the Attic
Book #3: Ghost Backstage
Book #4: Five O'Clock Ghost
Book #5: Secret Room
Book #7: King & Kayla and the Case of the Gold Ring
Book #8: King & Kayla and the Case of the Lost Library Book
Book #1: Mr. Summerling's Secret Code #1
Book #2: The Hidden Room #2
Book #3: Summer Island #3
Book #4: The Final Treasure #4