Borderline, by Nevada Barr

Placed on administrative leave after killing a man in Winter Study, Anna Pigeon and her husband embark on a rafting trip on the Rio Grande. Instead of healing, however, the vacation brings a nightmare of death and a fight for survival for both Anna and Paul and those traveling with them - including an infant Anna has rescued from the river. Who is trying to kill them and why? Recommended for fans of Dana Stabenow and Sue Henry.

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Suggested by Ingrid.