A recently retired English professor discovers a real knack for investigation and cannot help but interfere with the cases assigned to her police detective son.

　　Season 4 will pick up a full year after the events of Season 3, and business couldn’t be better at the Wild/Reid Detective Agency as Harry and Fergus welcome an unexpected client: Charlie Wild.　　Elsewhere, Harry is hired by a friend and former wild child turned nun; Lola stumbles upon a dance school myster; a Dublin literary tour takes a bloody turn; and Fergus’ hopes of going to college at the same time as Lola are threatened when she gets an incredible offer to study abroad.

第四季将讲述第三季事件发生整整一年后的故事，随着哈利和弗格斯迎来一位意想不到的客户：查理·怀尔德，怀尔德/里德侦探事务所的生意也异常红火。此外，哈利受雇于一位朋友，他曾是一个野孩子，现已成为修女；萝拉偶然发现了一位舞蹈学校的神秘人物；都柏林文学之旅发生了血腥转折；弗格斯想和萝拉同时上大学的梦想受到了威胁，因为她收到了一个令人难以置信的出国留学机会。