朝颜、真也、长女亚美、次女里美一家四口人的生活开始了。长大的亚美有时会说一些叛逆的话，让真也有些寂寞，但充满爱的幸福日子仍在继续。就在这时，溺死的尸体被发现。虽然也发现了遗书，被认为是自杀，但解剖发现溺死有几点可疑之处，他杀的可能性浮出水面。另外，相继发现疑似触电死亡的遗体，解剖结果表明两起事件有所关联。拼命搜查的真也，与山仓和森本等重案组的成员一起，逐渐接近前方的大事件。与此同时，亚美说“感觉看到了爷爷”，开始说起不应该在附近的平的不可思议的事情…
Senior Detective Terry Seattle is back and this time, the case is critical. Along with his two celebrity guest stars, Jason Bateman and Maya Rudolph, he is on a mission to figure out...who killed Santa? But here's the catch: Jason Bateman and Maya Rudolph aren't being given the script. They have no idea what's about to happen to them. Together, with Terry Seattle (and many surprises), they will have to improvise their way through the case... but it will be up to both of them to name the killer.
