Abduction! by Peg Kehret (2010)

Softcover in Good Condition Matt is missing. Bonnie's brother left his classroom to use the bathroom--and disappeared. A police dog traces his scent to the curb, where he apparently got into a vehicle. But why would Matt go anywhere with a stranger? Overwhelmed with fear, Bonnie discovers that her dog is gone, too. Was Pookie used as a lure for Matt? Bonnie makes one big mistake in her attempt to find her brother. In a chilling climax on a Washington State ferry, Bonnie and Matt must outsmart their abductor or pay with their lives.