Dresden Files: Venice
One of the Shadow Sisters present for the ritual to banish the spectre of Vico Malvera, she was later spotted lying twitching on the top floor of the tower room, were it was discovered she had been tasered by Roberto Malvera and was eventually rescued by Gina Tortelli with a pair of insulated cutters (Episode 9: Everything has Consequences).
Gina Tortelli and Chesko Barbini found her and Flavio Spina behind a curtain in the gallery (Episode 10: Pictures at an Exhibition). Chesko’s smile at her underwear was possibly the final point that brought the four together for some personal time.
Gina Tortelli attended a party hosted by Calandra and whilst talking to her found out she was also pregnant (Episode 12:Whats New Pussycat). After an involved conversation, they decided Calandra would approach Chesko Barbini over the subject of paternity.