To his family, Teddy is just a fluffy dog who likes naps, treats and doing absolutely nothing.
But the moment the humans leave, Teddy has work to do.
He is the unofficial guardian of the neighbourhood - helping lost animals, settling arguments, returning missing things and keeping an eye on anything suspicious.
And Teddy has one very important rule:
Never let the humans discover his secret.
Then a kitten called Luna disappears.
Following pawprints, strange clues and reports from his animal friends, Teddy searches gardens, alleys, buses and beyond. But this case is bigger than anything he has handled before - and eventually Teddy realises he cannot solve it alone.
There is only one person who might be able to help.
Nine-year-old Evie.
But asking her means breaking Teddy's biggest rule of all...
A warm, funny adventure about friendship, community, trust - and the extraordinary things an apparently ordinary dog gets up to when nobody is looking.