Saturday they were working on their tans. By Sunday they were working on staying alive.A group of high-school friends arrive at a seaside mansion in Mexico for a weekend of fun. Beyond friendship, they all have something in common - nearly a year before classmate Robin was poisoned at a party, and now slowly wastes away from kidney failure. None want to believe this act was intentional, but someone does. Is it Robin's sister Lena, who arranged the weekend? The mysterious Flynn? Or is someone desperate to keep a secret buried?Weekend is a great thriller that hauls the reader through a nicely crafted maze to an excellent finish. The epilogue, which is a bit sappy, could have been left out. But in a young adult novel perhaps it was necessary to mollify any complaints about realistic portrayals of what teens do when left to their own devices.