The Adventures of Nick and Sam, currently 9 Volumes in the series:

V0407 Perfect Gifts: The Adventures of Nick & Sam Book #1
V0406 Hidden Treasures: The Adventures of Nick & Sam Book #2
V0408 The Best Advent Ever: The Adventures of Nick & Sam Book #3
V0417 Trouble with Lent: The Adventures of Nick & Sam Book #4
V0416 A World of Wonder: The Adventures of Nick & Sam Book #5
V0418 View from the Top: The Adventures of Nick & Sam Book #6
V0419 Summer Blast: The Adventures of Nick & Sam Book #7
V0420 Summer Grace: The Adventures of Nick & Sam Book #8
V0421 Summer Discovery: The Adventures of Nick & Sam Book #9