Sins of a Mage. Sorceress Islands, #3

The aftermath can be as dangerous as the attack. Marii, a girl learning the trade of the natural healer, spends time with her father, when he is on duty guarding a dangerous magical bridge. Trouble has already happened. With her father almost unconscious from pain, Marii must use everything she has ever learnt to keep them both alive. Her skills as a healer will not be enough. This is the third story in Felicia Fredlund's excellent Sorceress Islands series.
A particularly dark fantasy short story.