Have YOU ever had a bad week? The hilarious new series taking the world by storm.

He's dressed up like a clown on national TV, his worst enemy is stealing the limelight, and there's definitely something weird happening with everyone's cats! Justin Chase is having the WORST WEEK EVER!

At least he's found a new BFF in international pop sensation, teen heartthrob and Justin's name twin, Justin Chase, right? Maybe not... As a case of mistaken identity leads to a disastrous kidnapping and Justin forced to race against the clock (and the ferocious dog) to escape!

Monday was mortifying, Tuesday was tumultuous, Wednesday was wild, but now it's... THURSDAY!

The fourth book in the hilarious new seven-part highly-illustrated series for fans of the globally bestselling Treehouse series.