11 books • 2 series
Book #1: It's True! There Are Bugs in Your Bed
Book #2: It's True! Frogs are Cannibals (2)
Book #4: It's True! There ARE bugs in your bed (4)
Book #11: It's True! Animals are electrifying (11)
Book #16: It's True! Space turns you into spaghetti (16)
Book #17: It's True! Hauntings happen and ghosts get grumpy (17)