Bone Breath to the rescue!

Bone Breath is now called Dr. Dog! Rosie Saunders' pet has become Oakwood Nursing Center's favorite visitor. But one day when Rosie and her friend Kayo Benton are making a 'pet therapy' visit to Oakwood, old Mr. Winters rambles on about 'the mustache man' with a gun.
They pay no attention … until the night's news. A man in the house across from Oakwood has been shot—and senile Mr. Winters is the only witness! The next day he's missing. Rosie and Kayo race to find him. But suddenly, they're prisoners themselves!

“There’s plenty of suspense.”—School Library Journal