This was a most interesting read, original and a page turner, though I did find the beginning, in which the characters were actually 'introduced' to the reader, a bit confusing at first. However, once the story got under way it was definitely a very good, if very bleak, read,
Four young, smart, out of work Berliners think up a surefire way to make money - they will open an agency dedicated to apologising on behalf of, mainly, companies to people they have unfairly sacked or otherwise swindled. They find themselves much in demand, until a killer contacts them wanting their services to apologise to his victim, and from that moment things get very dark indeed.
There is violence, and misunderstanding, and deaths, and the four find themselves doing things they would never have dreamed of doing. Evil is there, and past cruelty and injustice, and life, for the lucky ones, certainly will never be the same again.
I found the characters well delineated, and sympathetic. They did not know what they were getting into and once in their behaviour was very human.
An unsettling book but well worth reading.