Dr. Steven Sorenson plans to tap the geothermal energy of the Earth's interior by means of a thermonuclear device detonated deep within the Earth. Despite dire warnings by fellow scientist Ted Rampian, Dr Sorenson proceeds with the experiment after secretly learning that he is terminally ill. This experiment causes a crack to form and grow within the earth's crust, which threatens to split the earth in two if it is not stopped in time.

Code of Silence introduces us to Deaf catering worker, Alison Woods. She’s struggling to make ends meet, juggling two jobs, in a police canteen and a local bar, while also doing her best to support her Deaf mum, Julie. When DC Ashleigh Francis calls on Alison to lip read the conversations of some dangerous criminals, she is plunged into a new and exhilarating world.　　Alison’s interpretation of the gang's clandestine meetings quickly become key to unlocking the police investigation. But Alison's feelings about the case become complicated when she finds herself drawn to Liam, one of the main suspects. Alison knows she's putting herself at risk by agreeing to work with the police, and when things threaten to spill over into her personal life, she knows she should step away. But Alison can’t let go…

该剧设定在20世纪90年代，男孩Cameron（迈尔斯·赫尔泽 Miles Heizer 饰）在家庭破碎、社会偏见与校园欺凌的多重压力下，选择隐瞒自己的性取向，与直男好友Ray（利亚姆·吴 Liam Oh 饰）一同加入美国海军陆战队训练营，在严苛的军事环境中挣扎求存并寻求自我认同。                                                                    　　剧名中的军靴象征着军队文化与男性气质的规训，而隐藏则直接指向主角在军旅生涯中必须压抑真实自我的生存状态。