Four good liars / Sarah Wishart.

Sarah J. Harris writes YA novels under the pseudonym Sarah Wishart.

Layla. Kai. Liam. Fliss. Terrified big sister. Troubled surfer. Insecure genius. Pampered princess. They have nothing in common, except they were all on the school bus that morning. The morning of the crash. The morning they discovered the dead driver's holdall, containing one million pounds -- and a gun. All of them have secrets, and all of them need that money. But someone dangerous is hunting it down, and drawing closer every minute. If Layla, Kai, Liam and Fliss want to survive, they'll need to stick together. But can four good liars really trust one another? Or are some truths just too powerful to stay buried...?

Adolescent.