There has been data ("Pretty Little Liars Series: 1-8 (Set of 8 Books: Pretty Little Liars, Flawless, Perfect, Unbelievable, Wicked, Killer, Heartless, Wanted)") available for this ISBN from the data sources that books-by-isbn.com uses, but not on the latest request on Fri Jan 3 16:54:42 2020, so the data displayed here has been removed .