Lauren Child's (dedicated*) Ruby Redfort series began in 2011 with Look into My Eyes, with Take Your Last Breath published in 2012. The 2013 offering is as yet untitled. There has also been this for World Book Day - Hang in There Bozo: The Ruby Redfort Emergency Survival Guide for Some Tricky Predicaments.
This is not a series I've read yet but it is enjoyed by my reading group of 10-12 year olds.
* Ruby Redfort first appeared in the Clarice Bean novels.