天使研討會的與會者被發現陳屍旅館房間，遭人毆打致死。最初，嫌疑落在另一名與會者Hanne Wegener身上，她在案後就不見蹤影。她是督察長Carl Sievers的舊識，但Carl不願意讓同事Hinnerk Feldmann和Ina Behrendsen知道這件事。Feldmann別無選擇，只好報名參加天使研討會並臥底調查與會者。
An attendee at an angel seminar is found in his hotel room, beaten to death. Initially, suspicion falls on fellow seminar attendee Hanne Wegener, who has been missing since the murder. Chief Inspector Carl Sievers apparently knows her from his past, but he is not willing to confide in his fellow officers Hinnerk Feldmann and Ina Behrendsen. Feldmann is left with no other option but to s
n up for the angel seminar and investigate the attendees while undercover.
