But was It Murder?

Alex,he is rich,affluent, and handsome man lives in the beauitiful house at London.He has atractive girlfriend and a close group of friends. Now, he is dead in his house, and the police find out a lot of cash in the house. Does someone kill he or he kill himself? But why? His girlfriend? his nebighbor or his doctorter? Every one can be the killer.
The book is interested, and the language are easy to read.