Author-illustrator Monica Arnaldo serves up a hilarious picture book about a kindergarten class arriving for the first day of school that can't find their teacher—only a delicious-looking sandwich and the words "Mr. S" scribbled on the chalkboard. Chaos ensues as the kids argue whether or not the sandwich must be their teacher. A comical book of mayhem and chaos, perfect for back-to-school and fans of Miss Nelson Is Missing.

It was the first day of school.

But even the kindergarteners of room 2B could tell something was seriously wrong. . . .

Where was the teacher?

Who left this sandwich on the desk?

The only clue, written neatly on the chalkboard, were three simple letters:

Mr. S