Esther Solars family is unusual. Her father hasnt left the basement in 6 years. Her brother is terrified of darkness. Esther isnt afraid of anything, a feat she achieves by avoiding pretty much everything. Elevators are off limits, as are open spaces, crowds, family pets, birds, needles, haircuts, dolls and mirrors. Then Esther is mugged by her old classmate, Jonah Walker. Jonah is just as she remembers him: rude, cocky and from a broken family. Hes also utterly fearless. Jonahs theft brings their lives crashing back together, and Esther and Jonah become surprising friends. Jonah sets a challenge: every week they must work their way through the worlds 50 most common phobias.