White shotgun

the long version

Even on leave from the FBI, Special Agent Ana Grey can't kick old habits: when she witnesses a drive-by shooting at an Italian restaurant in London, she helps the injured and gives testimony to the police. Still, it comes as a shock when, soon after, the Bureau contacts her--not to investigate the shooting, but to investigate the half sister she never knew she had, Cecilia, who lives in Siena and is married to Nicosa, a coffee mogul with some suspicious connections. Settling into their home under false pretenses is the least of the complications Ana encounters. The entire city of Siena is gearing up for its legendary horse race, the Palio. But when her nephew is stabbed and her sister goes missing, Ana understands with painful clarity that there's more than a horse race at stake here.--From publisher description.