Post s3. Phryne arrives back in Australia and is instantly thrown into a case which nearly costs her her life. As they work on new cases together, Phryne and Jack must also confront the mystery surrounding their own relationship, which is further complicated by an unexpected surprise which will change both their lives forever.

There aren't nearly enough women in the State of Victoria who shoot target rifle, thought Jack at no point ever. So why does he decide to connive to add to their number?