Murder on Fridays

Nina is a botanist. Not a bluestocking, but a real researcher. When the municipal botanical garden she worked in was closed, Nina could not even dream of such fortune: Vladimir Shelekhov, a businessman, heir to the old princely family and a very eccentric man, invites her to work in his luxurious villa instead of escaped gardener. The villa has museum status and is a tourist attraction visited by people from all over the country. Every Friday, the tourists can visit not only a garden and several rooms with historical interior, but the whole house. On one of these Friday Nina witnesses a sudden death of the villa's owner. A week later, at the funeral of Shelekhov, there is another mysterious death - his eldest son was poisoned. Further events leave no doubt: someone wants to kill the entire Shelekhov family. Nina has to reveal the initiator of mysterious murders and attempted murders, the old secret of the villa mistress, and the relation of the disappeared gardener to it.