When a well-known British TV historian, Marmaduke Godolphin, is found murdered in the canals of Venice during carnival, stabbed by a stiletto blade, the Venetian police are eager to have the case solved and cleared up within a day—murder is bad for tourism! The police recruit the help of retired archivist, Arnold Clover. Godolphin had hired his services on arriving in Venice to help sort through some historical papers of note. These dusty documents may contain previously unknown information about the assassination of the murderer, Lorenzino de' Medici, 500 years previously.

Film producer Pero Baltazar thought he was taking a Berlin filming assignment. He needed the work, needed to get back in the saddle after fighting off a life-threatening experience in East Africa - al-Shabaab had attacked his crew, intent on a much larger terrorist attack. Suddenly he finds himself under orders from his part-time employers at the State Department and the CIA when he is handed a mysterious package. It's an assignment he doesn't want. The problem is, it is a job contracted by mysterious patrons.

The Palazzo Colombina is home to the Uccello family: three generations of men, trapped together in the dusty palace on Venice's Grand Canal. Awkward 15-year-old Nico. His distant, business-focused father. And his beloved grandfather, Paolo. Paolo is dying. But before he passes, he has secrets he's waited his whole life to share.

In a hushed Vatican reading room, the scene was shocking: a crazed professor shot dead after brandishing evidence of a grisly crime. Moments later, two bodies are found in a nearby church, each with a gruesome calling card from the killer.

It was supposed to be our last weekend away as friends, before marriage and respectability beckoned. But what happened that Saturday changed everything. We killed a stranger and covered it up. In the middle of the night, someone died. We didn’t know our victim was a serial killer. The six of us promised one another we would not tell anyone about the body we buried. But now the pact has been broken. We don’t think he was working alone. And the killing has started again....