Kennen's first book, Beast, was created during a Master of Arts program in Creative Writing at Bath Spa University. It was published by Marion Lloyd Books in 2006 and the British librarians named it one of six finalists for the annual Carnegie Medal, which recognises the year's best children's book published in the U.K. The judges recommended it for readers age 12 and up.
Her fourth book, Sparks, published by Marion Lloyd in 2010, was one of eight books on the longlist for that year's Guardian Children's Fiction Prize. The Prize is judged by a panel of children's writers and it annually recognises one new British children's novel by an author who has not won it. The judges recommended Sparks for readers age 9 and over. According to their summary, the adventure novel features three children who decide to follow their deceased grandfather's unusual instructions regarding his funeral. The mission sets them against the adults in the family and against the law.
Two years later Kennen made the Guardian Prize longlist again with Bullet Boys, published by Scholastic in 2012 (recommended for ages 14+). It had been The Guardian newspaper's "teen book of the month" for March, initiated by Anthony McGowan's review and by Kennen's account, "How I wrote Bullet Boys". 
- Beast (2006)
- Berserk (2007)
- Bedlam (2009)
- Sparks (2010)
- The Hedgehog Mystery (2011)
- Quarry (2011) 
- Bullet Boys (2012)
- Daybreak (2012)
- Midnight Pirates (2013)
- How To Speak Spook (And Stay Alive) 2015
Awards and nominations
Kennen has been nominated for many other annual book awards.
- Beast (2006) made shortlists for the Carnegie Medal, the Booktrust Teenage Prize, the Branford Boase Award, and the Bolton Children's Book Award
- Berserk (2007) made the Manchester Book Award shortlist and was nominated for the Carnegie Medal.
- Bedlam (2009) was nominated for the Carnegie Medal (2010) and made shortlists for the Solihull Children's Book Award, the UKLA, the Salford Children's Book Award, the Calderdale Children's Book, and the Stockport Schools Book Award. It made the Guardian Prize longlist and was nominated for the Carnegie Medal.
- Quarry (2012) made shortlists for the Coventry Inspiration Book Awards, the Grampian Children's Book Award, and the Leeds Book Awards. It made the UKLA longlist and was nominated for the Carnegie Medal.
- Bullet Boys (2012) made the 2012 Guardian Prize longlist.
- "The Guardian children's fiction prize 2010". Julia Eccleshare. The Guardian 28 May 2010. Retrieved 2012-10-26.
- Ally Kennen. Sparks LONGLISTED FOR THE GUARDIAN CHILDREN'S FICTION PRIZE!". 15 January 2010.
- "Discover the Guardian children's fiction prize 2012 longlist - gallery". theguardian 8 June 2012. Retrieved 2012-10-26.
- "Ally Kennen: How I wrote Bullet Boys". Ally Kennen. guardian.co.uk 2 March 2012. Retrieved 2012-10-26.
- "Bullet Boys by Ally Kennen – review". Anthony McGowan. guardian.co.uk 2 March 2012. Retrieved 2012-10-26.
- Ally Kennen. "BEDLAM OUT TODAY!!!! BEDLAM OUT TODAY!!!". 5 January 2009.
- Ally Kennen. "QUARRY is new title for RITES. And SPARKS out soon!". 27 February 2010.
- Manchester Book Award home page.
- Booktrust Books for Teens home page.
- Branford Boase Award home page.
- Bolton Literacy home page.
- Official website
- "Rip Tide", a short story by Ally Kennen at Scottish Book Trust, June 2008
- "Bullet Boys by Ally Kennen: Guardian young critics' awards review". Emma Bird, age 12. theguardian. 24 October 2012.