Characters in To the Nines

Stephanie Plum

Also in One for the Money, Two for the dough, Three to Get Deadly, Four to Score, High Five, Hot Six, Seven Up, Hard Eight, Visions of Sugar Plums, Ten Big Ones

Samuel Singh

Vinnie Plum

Also in Sizzling Sixteen

Ranger

Also in One for the Money, Two for the dough, Three to Get Deadly, Four to Score, Hot Six, Seven Up, Hard Eight, Ten Big Ones, Eleven on Top, Twelve Sharp

Lula (Stephanie Plum series))

Also in One for the Money, Two for the dough, Three to Get Deadly, Hot Six, Seven Up, Hard Eight, Eleven on Top, Lean Mean Thirteen, Plum Lucky, Plum Spooky

Joseph "Joe" Morelli

Also in One for the Money, Two for the dough, Three to Get Deadly, Four to Score, High Five, Hot Six, Seven Up, Hard Eight, Ten Big Ones, Eleven on Top

Tank

Also in High Five, Lean Mean Thirteen, Fearless Fourteen