But there's a Christmas crisis - the elves are unwell and can't finish the toys! Does mysterious stranger and gadget queen, Flo Frost, really want to help? Or could she have her eyes on the most magical gadget of all ... Santa's flying sleigh?!

It's up to Shifty and Sam to race across the snowy slopes and save Christmas for everyone!Shifty McGifty and Slippery Sam is a hugely successful, action-packed series about two baker-dogs who used to be robbers, but now solve mysteries and sniff out crimes!

Tracey Corderoy is a multi-award-winning author and has written over 70 books for children including collaborations with Rosalind Beardshaw and Sarah Massini. Steven Lenton has created many books with Tracey Corderoy and also illustrates books by David Baddiel, Frank Cottrell-Boyce and Peter Bently.

 Shifty McGifty and Slippery Sam Shifty McGifty and Slippery Sam: The Cat Burglar Shifty McGifty and Slippery Sam: The Diamond Chase

Shifty McGifty and Slippery Sam: The Missing Masterpiece

Have you read Shifty and Sam's two-colour early readers? Shifty McGifty and Slippery Sam: Jingle Bells! Shifty McGifty and Slippery Sam: Up, Up and Away! Shifty McGifty and Slippery Sam: The Spooky School Shifty McGifty and Slippery Sam: The Aliens Are Coming!