There are 4 books in the Runaways: The Complete Collection series. The newest book is Runaways which came out in 2015.

Collects Runaways (2003) #1-18.

They were six normal teenagers linked only by their wealthy parents’ annual business meeting…until a chance discovery revealed the shocking truth: their parents are the secret criminal society known as the Pride! For years, the Pride controlled of Los Angeles’ criminal activity, ruling the city with…
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3
Runaways

By Brian K. Vaughan , Joss Whedon ,

Book cover of Runaways: The Complete Collection Volume 3
As the superhuman Civil War threaten to crush the Runaways, fellow teen team the Young Avengers offer assistance - but how can the Runaways trust that they're on the same side? As the Runaways make hard decisions about their future, they confront a horrific enemy who threatens to tear the…

4
Runaways

By Kathryn Immonen, Humberto Ramos (artist), Terry Moore

Book cover of Runaways: The Complete Collection Volume 4
The Runaways' adventures conclude! Soldiers from Karolina's home planet arrive, demanding that she be handed over. Squabbling over the best course to take, the Runaways begin to fracture. Can they face the alien threat when they can't face one another? Meanwhile, a DJ creates a mystical song that transforms anyone…