A hit and run of an 18 year old girl becomes the hub of a wheel that sets into motion many a spoke - a journalist , a raging mother, a cop and a system all caught in an ethical dilemma. Questions raised only to realise that truth is rarely pure and never simple.

　　梧桐中學高二十八班是遠近聞名的問題班級，后進生、藝術(shù)生、體育生、不良少年聚集在此，以宋宸（柯焱曦 飾）為首的男生幫派和以秦淼淼（熊婧文 飾）為首的女生幫派互相不服，班級混亂無序。一天，高二十八班收到了一封信，這封信自稱是由一年后的他們集體寄來。信上說，即將調(diào)來的班主任譚 睿明（秦海 飾）會改變十八班，成為對他們最重要的人。然而在一年后的未來，譚老師卻永遠地離開了他們。為了實現(xiàn)一段沒有遺憾的青春，扭轉(zhuǎn)歷史，少年們決定按照信上所說，挑戰(zhàn)一個個不可能實現(xiàn)的任務(wù)...

　　After a collision with a comet, a nearly 8km wide piece of the asteroid "Orpheus" is heading towards Earth. If it will hit it will cause a incredible catastrophe which will probably extinguish mankind. To stop the meteor NASA wants to use the illegal nuclear weapon satellite "Hercules" but discovers soon that it doesn't have enough fire power. Their only chance to save the world is to join forces with the USSR who have also launched such an illegal satellite. But will both governments agree?

　　某座城市的驗尸房，艾米（丹妮爾·哈麗絲 Danielle Harris 飾）行色匆匆，準備參加親朋為她準備的生日派對。而就在此時，慘無人道的大屠殺在城中另一個角落發(fā)生，九人遇害，而屠戮他們的兇手雅克布·古德奈特（Glen Jacobs 格蘭·“凱恩”·雅克布 飾）也在救護車上咽下最后一口氣。眼看派對泡湯，艾米只得和同事賽斯（卡吉-埃里克·埃里克森 Kaj-Erik Eriksen 飾）打起精神準備接收送來的尸體。而就在此時，艾米的哥哥威爾（格里斯頓·霍爾特 Greyston Holt 飾）帶著凱拉（切蘭·西蒙斯 Chelan Simmons 飾）、塔瑪拉（凱瑟琳·伊莎貝爾 Katharine Isabelle 飾）等好友潛入驗尸房，精心為妹妹準備了盛大歡快的派對。　　膽大妄為的男女們縱情歌舞，卻不料雅各布已悄然醒來……