What is an example of symbolism in the novel, Booked?

When Nick's bike is stolen by the bullying Eggleston twins, it symbolically represents the loss a loss of freedom and identity, both of which Nick regains in the aftermath of finding his bike again, finding enough courage in himself to face down those who stole both his bike and a degree of his freedom to be himself. Therefore, Nick's bike is more symbolically important in its absence, it seems, than in its initial presence.