在摩洛哥坦吉尔的一家赌场,有位美丽的女郎叫做莫蒂丝缇,她是老板陆许的得力助手。某日,赌场内冲进来一群凶神恶煞的抢匪,一进门就喝令大家不准动,并要他们打开赌场内金库,莫蒂丝缇为了保全大家的性命,开始跟抢匪老大周旋,以争取时间救人,抢匪老大对谜样的莫蒂丝缇很感兴趣,于是与她展开一场冒险的轮盘赌局……When her surrogate father who owns the casino she works in gets murdered, Modesty Blaise takes on those that killed him and are now at the casino to rob it. It turns out she is more than just a modest worker.