Calendar Mysteries (2009–2014) — book series in order

Manyebook

January Joker (2009)
April Adventure (2010)
February Friend (2010)
June Jam (2011)
May Magic (2011)
August Acrobat (2012)
July Jitters (2012)
October Ogre (2013)
September Sneakers (2013)
November Night (2014)