Myth-taken Identity - Robert Asprin

Aahz gets an unwelcome visit from two blue-skinned bruisers and a small magician wanting Skeeve to cough up the dough for an extremely large bill that he skipped out on. Knowing that Skeeve has many faults, but welshing on a debt is not one of them, he enlists the aid of Chumley and Massha to go with him to the last place any self respecting Pervert would ever visit...the mall! Once there, they discover that the mall rats have created a scheme to steal customers' credit cards. Realizing that Skeeve is a victim of identity theft they set our to set matters right and to clear their friend's name...