Started 'Heartless'

Before I begun to read the "Fault in our Stars' I tried reading the 7th book in the Pretty Little Liars series; a series i have been reading since 8th grade.  I started 'Heartless' right before winter break, but after getting past a few chapters, i felt like i would rather read the Fault in Our Stars because I have heard how great it is.  I will probably go back to 'Heartless', because i know it will be great, but for now i decided to take a little break from that series.  I have always loved PLL, the show and the books so I know that I would love this book if i read it.  To anyone thinking of beginning the Pretty Little Liars series I suggest starting on the first book so you can understand what is happening.  It has great characters, suspense, and surprise and i love the series.  For now i will read the Fault in our Stars but i will definetly go back to Pretty Little Liars.