Mr Welsborough is having a party for his 50th birthday. He is happy to receive a phone call from his son, travelling in Tibet. But the call is interrupted. One week later, after a car crash, the body of his son is found right in front of the house.
Sent by the police, Sherlock solves the mystery right away. He is more intrigued by the disappearance, in the house, of a bust of Margaret Thatcher. In this strange theft, he sees a hint of what is really obsessing him: Moriarty's inheritance.
But the trail may lead to a troubling discovery about Mary's past.
