When a lost dog helps Laura find a way home to her family, they discover family in each other along the way.

While his human Elliot adjusts to his new home and stepfamily, Gizmo, an evil genius guinea pig, searches for a new evil lair where he can plot to take over the world, but Gizmo is constantly thwarted by Elliot's little stepsister Jasmine (who likes to play dress-up), Abuela (who may or may not like to eat cavies), and Wedgie (a Corgi superhero and Gizmo's nemesis).

"Spencer Quinn speaks two languages--suspense and dog--fluently."--Stephen King Bowser is a dog detective on the loose, paired with an eleven-year-old girl, Birdie. Bowser and Birdie live on the Louisiana coast with Birdie's Grammy. When a prize stuffed marlin is stolen from Grammy's bait and tackle shop, Birdie and Bowser decide to take on the case. But what looks like a straightforward break-in soon becomes as tangled as a tourist's fishing line....

Sassy and Waldo are good dogs, who keep their house safe (from squirrels, mostly), and worry about their boy, Stewart, who always comes home from school smelling of anxiety; so the two dogs come up with a plan to help him--they will dress up in a trench coat and attend school, posing as a new student, to find out just what is bothering Stewart.