Mydworth Mysteries - A Fatal Affair

When Harry takes Kat to Venice for their wedding anniversary, he
promises parties on the Lido, sunset dinners, and dancing in the
moonlight. But when the US embassy in Rome quietly asks them to help
investigate the mysterious death of an undercover Treasury agent,
romance must wait. And within hours – in this great city of canals and
bridges – they're caught in a dangerous and deadly race to expose a
criminal conspiracy before another murder can be committed ...

More via the publisher's website https://www.luebbe.de/luebbe-audio/audio-downloads/krimis/mydworth-mysteries-a-fatal-affair/id_10218872