Spring is finally arriving in Zurich. But Valerie Gut is desperate. Mysterious incidents occur in her bicycle shop "FahrGut": Accessories are repeatedly stolen, Valerie is insulted in an anonymous letter, a customer does not return from a test drive with an expensive bike, 4,000 francs disappear from the cash register. And then there is a dead man in the shop. Kill. A real challenge for the experienced investigator Beat Streiff from the Zurich City Police and his young, energetic colleague Zita Elmer.

Isabel Morf was born in Graubünden and grew up in the canton of Glarus and in the Mittelland. She has lived in Zurich for many years, with the exception of one year she spent during her studies in German studies in Vienna, where her favourite coffee house was the "Jelinek". For several years, as a freelance journalist, she wrote reports on social issues, including – and with particular interest – reports on court proceedings at the Higher Court of Zurich, which in retrospect proves to be a useful training course. Later she worked part-time as a parliamentary editor for the Federal Parliament in Bern. This gave her time to come up with all sorts of criminals, which she did not put into action, but merely wrote down. Today she lives and writes in Zurich and on the east coast of Scotland.