Originally published in Italian as "La giostra degli scambi" by Sellerio Editore, c2015.

After a hectic morning, Inspector Montalbano arrives in his office ready to find out what's troubling Vigta this week. What he discovers is unnerving. A woman on her way home from work has been held up at gunpoint, chloroformed and kidnapped, but then released just hours later unharmed and with all her possessions into the open countryside. Later that day, Montalbano hears from Enzo, owner of his favourite restaurant, that his niece has recently been the victim of the exact same crime. Before long, a third instance of this baffling overnight kidnapping has been reported. The only link between the these events is that all women are 30 years old and work in a bank. What exactly is this mystery assailant gaining from these fleeting kidnappings? And what can he do to stop them? Montalbano must use all his logic and intuition if he is to answer these pressing questions before the kidnapper finds his next victim.

Translated from the Italian.