At first Abby and Tess are excited to be pet-sitting a lizard named Angus. But one visit to Mr. Maggioli's house convinces them that lizards are a lot harder to look after than they thought. When Angus disappears, Abby is quick to blame Tess. Things go from bad to worse, and before long Abby finds herself in even bigger trouble. But who's to blame this time? What will she tell her best friend Rachel? The only person who can save her now is Tess.