Long - running series such as Rick Riordan 's ` ` Heroes of Tomorrow '' are coming up . First of three books by Walter Dean Foster to be coming posthumously out this fall . Carl Hiaasen 's first book for teens debuts in September . New series from ` ` Pretty Little Liars '' author Sara Shepard due out this fall .
Long-running series such as Rick Riordan 's `` Heroes of Olympus '' are wrapping up . First of three books by Walter Dean Myers to be published posthumously out this month . Carl Hiaasen 's first book for teens debuts in September . New series from `` Pretty Little Liars '' author Sara Shepard due out this fall .